Open Source Windows Security Software - Page 18
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Security Software for Windows
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AdGuard Filters
AdGuard Content Blocking Filters
AdGuard Filters is an open-source repository that contains a comprehensive collection of content-blocking rules used by AdGuard and other ad-blocking software to filter unwanted web content. These filters are composed of text-based rules that instruct applications to block advertisements, trackers, pop-ups, and other intrusive elements from web pages. The project is continuously updated by contributors who identify new advertising domains, tracking scripts, and annoyance elements across a wide range of websites. It includes multiple specialized filter lists targeting different types of content, such as general ads, privacy threats, social widgets, and regional advertising networks. The repository is designed to be compatible with various platforms, including browser extensions, mobile apps, and DNS-based blocking systems. -
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Alerta
Alerta monitoring system
Email was not designed to be used as an alert console. It is not a scalable solution when it comes to monitoring and alert visualization. A minimal installation of Alerta can be deployed quickly and easily as monitoring requirements and confidence grow. There are integrations available with Prometheus, Riemann, Nagios, Zabbix, netdata, Sensu, Pingdom and Cloudwatch. Integrating bespoke systems is easy using the API or command-line tool. Alerts are submitted in JSON format to an HTTP API. Alerts can be queried from the command line or viewed in a slick web console optimized for desktop, tablet, and mobile. User logins can be added using Google, GitHub or GitLab OAuth and programmatic access is managed using API keys. -
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American Fuzzy Lop
American fuzzy lop - a security-oriented fuzzer
AFL (American Fuzzy Lop) is a widely used graybox fuzzer that discovers bugs by mutating inputs and steering execution using lightweight instrumentation. Instead of random mutations alone, it uses coverage feedback to evolve input corpora, pushing programs into deeper and more interesting code paths. Its workflow emphasizes quick start: point it at a target binary with compile-time instrumentation (or use QEMU-based mode when recompilation isn’t possible), seed it with a small corpus, and let it iterate. AFL is known for finding serious security issues in complex software due to its corpus minimization, queue management, and deterministic mutation stages that balance breadth and depth. It provides crash triage helpers and test case minimization so developers can reproduce and fix issues quickly. The design deliberately optimizes for robustness and speed on commodity hardware, which helped it become a standard part of many security testing pipelines. -
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Authelia
The Single Sign-On Multi-Factor portal for web apps
Authelia is an open-source authentication and authorization server and portal fulfilling the identity and access management (IAM) role of information security in providing multi-factor authentication and single sign-on (SSO) for your applications via a web portal. It acts as a companion for common reverse proxies. With a compressed container size smaller than 20 megabytes and observed memory usage normally under 30 megabytes, it's one of the most lightweight solutions available. Written in Go and React, authorization policies and many other backend tasks are completed in mere milliseconds and login portal loading times of 100 milliseconds makes it one of the fastest solutions available. Processors can use a lot of electricity, but when idle usage is basically so low that you can't measure it, and active usage in a small business environment being under 1% you can rest easy (with the exclusion of password hashing). -
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AutoVPN
Create on demand disposable OpenVPN endpoints on AWS
Script that allows the easy creation of OpenVPN endpoints in any AWS region. Creating a VPN endpoint is done with a single command that takes ~3 minutes. It will create the proper security groups. It spins up a tagged ec2 instance and configures OpenVPN software. Once the instance is configured an OpenVPN configuration file is downloaded and ready to use. There is also functionality to see which instances are running in which region and the ability to terminate the instance when done. Additional functionality includes specifying instance type, generating ssh keypairs, specifying custom AMI, changing login user, and more to come. Create on-demand OpenVPN Endpoints in AWS that can easily be destroyed after done only pay for what you use. -
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Awesome Privacy
A curated list of privacy & security-focused software and services
Awesome Privacy is a curated directory of privacy-respecting alternatives to mainstream apps and services, organized across many categories like browsers, search, email, messaging, cloud storage, and operating systems. It aims to help you choose tools that reduce tracking, fingerprinting, and data collection without sacrificing usability. Each entry highlights the project’s core properties—such as open source status, end-to-end encryption, and platform availability—so you can evaluate trade-offs quickly. Because product landscapes change fast, the list emphasizes ongoing maintenance and community discussion around quality and trust. It’s useful for privacy newcomers planning a gradual migration as well as experts building a hardened toolchain. The project also surfaces learning resources and practical guidance so you can understand the broader privacy landscape, not just pick tools in isolation. -
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Betterlockscreen
Sweet looking lockscreen for linux system
Fast and sweet-looking lock screen for Linux systems with effects. Most i3lock wrapper scripts out there take an image, add some effect(s) then lock with the modified image as a locker background. Overall experience doesn't feel natural given the delay of 2-3 seconds. So Betterlockscreen was my attempt to solve this problem, as we don't need to change the lockscreen background frequently this script caches images with effect so the overall experience is simple and as fast as native i3lock. The script takes a directory or image, adds various effects and caches the images in a special directory. Those cached images will be used as locker background depending on the configuration provided by the user. -
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Bitwarden Server
The core infrastructure backend of Bitwarden
Bitwarden Server is an open source project that contains all of the core infrastructure backend of all Bitwarden client applications. This includes APIs, database, Docker and other infrastructure items. Bitwarden is an open source password management solution that stores sensitive information in an encrypted vault. This project is written in C# using .NET Core with ASP.NET Core, while the database is written in T-SQL/SQL Server. Cross-platform, its codebase can be developed, built, run and deployed via Docker containers on Windows, macOS, and Linux distributions. -
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BlackMamba
C2/post-exploitation framework
Black Mamba is a Command and Control (C2) that works with multiple connections at same time. It was developed with Python and with Qt Framework and have multiple features for a post-exploitation step. -
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CTFd
CTFs as you need them
CTFd is a Capture The Flag framework focusing on ease of use and customizability. It comes with everything you need to run a CTF and it's easy to customize with plugins and themes. Create your own challenges, categories, hints, and flags from the Admin Interface. Dynamic Scoring Challenges. Unlockable challenge support. Challenge plugin architecture to create your own custom challenges. Static & Regex-based flags. Custom flag plugins. Unlockable hints. File uploads to the server or an Amazon S3-compatible backend. Limit challenge attempts & hide challenges. Automatic bruteforce protection. Individual and Team-based competitions. Have users play on their own or form teams to play together. Scoreboard with automatic tie resolution. Hide Scores from the public. Freeze Scores at a specific time. Scoregraphs comparing the top 10 teams and team progress graphs. Markdown content management system. SMTP + Mailgun email support. Email confirmation support. Forgot password support. -
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Chronograf
Open source monitoring and visualization UI for the TICK stack
Chronograf allows you to quickly see the data that you have stored in InfluxDB so you can build robust queries and alerts. It is simple to use and includes templates and libraries to allow you to rapidly build dashboards with real-time visualizations of your data. Access control is only available in InfluxDB Enterprise and InfluxDB Cloud. Chronograf offers a complete dashboarding solution for visualizing your data. Over 20 pre-canned dashboards are available to allow you to get started very quickly. You can easily clone one of this pre-canned dashboard to create customized dashboards or build them from scratch — either way, you can build the perfect dashboard to fulfill your visualization needs! Chronograf is the administrative tool for all your InfluxData deployments, the open source instances of InfluxData as well as InfluxDB Enterprise and InfluxDB Cloud instances. -
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Claude Code Security Reviewer
An AI-powered security review GitHub Action using Claude
The claude-code-security-review repository implements a GitHub Action that uses Claude (via the Anthropic API) to perform semantic security audits of code changes in pull requests. Rather than relying purely on pattern matching or static analysis, this action feeds diffs and surrounding context to Claude to reason about potential vulnerabilities (e.g. injection, misconfigurations, secrets exposure, etc). When a PR is opened, the action analyzes only the changed files (diff-aware scanning), generates findings (with explanations, severity, and remediation suggestions), filters false positives using custom prompt logic, and posts comments directly on the PR. It supports configuration inputs (which files/directories to skip, model timeout, whether to comment on the PR, etc). The tool is language-agnostic (it doesn’t need language-specific parsers), uses contextual understanding rather than simplistic rules, and aims to reduce noise with smarter filtering. -
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ClusterFuzz
Scalable fuzzing infrastructure
ClusterFuzz is a scalable fuzzing infrastructure that finds security and stability issues in software. Google uses ClusterFuzz to fuzz all Google products and as the fuzzing backend for OSS-Fuzz. ClusterFuzz provides many features which help seamlessly integrate fuzzing into a software project's development process. Can run on any size cluster (e.g. OSS-Fuzz instance runs on 100,000 VMs). Fully automatic bug filing, triage and closing for various issue trackers (e.g. Monorail, Jira). Supports multiple coverage guided fuzzing engines (libFuzzer, AFL, AFL++ and Honggfuzz) for optimal results (with ensemble fuzzing and fuzzing strategies). Statistics for analyzing fuzzer performance, and crash rates. Easy to use web interface for management and viewing crashes. Support for various authentication providers using Firebase. -
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Crypt-LE
Let's Encrypt / Buypass / ZeroSSL and other ACME-servers clients
Crypt-LE is a Perl module and command-line client that facilitates obtaining SSL certificates from Let's Encrypt and other ACME-compatible Certificate Authorities. It supports various verification methods and simplifies certificate management processes. -
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DeepBlueCLI
PowerShell Module for Threat Hunting via Windows Event Logs
DeepBlueCLI is a PowerShell-centric threat-hunting toolkit built to extract, normalize, and flag suspicious activity from Windows event logs and Sysmon telemetry. It parses common sources—including Windows Security, System, Application, PowerShell logs, and Sysmon event ID 1—then applies a rich set of detection heuristics for things like suspicious account changes, password guessing and spraying, service tampering, PowerShell obfuscation and download-string usage, long or unusual command lines, and credential dumping attempts. Output is emitted as native PowerShell objects so analysts can pipe results to CSV, JSON, HTML, GridView, or custom pipelines for further triage and reporting. The codebase includes helpers for command-line decoding and de-obfuscation (automatic base64/deflate handling), safelisting/hash workflows (DeepBlueHash), and sample EVTX files so teams can test the tool on realistic attack traces. -
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Flashbang
Project "Flashbang" - An open-source Flash-security helper
Flashbang is an open-source Flash-security helper tool designed to extract and display flashVars from a SWF that is “naked” (i.e. not wrapped in a bigger application) so that security testers can begin analysis (e.g. for XSS or other vectors) without decompiling the whole SWF. It is built atop Mozilla’s Shumway project. It works in modern browsers via HTML/JS, can also be run locally, and does not upload SWFs to servers (processing stays local). It is still considered alpha quality. Clone the repo using the --recursive flag, so that all necessary submodules are cloned as well. Ideally, clone it into an Apache web-root (or any other web server). Prepare the environment for Shumway to work properly. -
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Flowsint
Graph-based OSINT investigation platform w visual relationship mapping
Flowsint is an open source OSINT investigation platform designed to help analysts explore and understand relationships between digital entities through a visual graph interface. The platform focuses on reconnaissance and open source intelligence workflows, enabling investigators to map connections between domains, IP addresses, organizations, individuals, and other data points. By presenting these relationships in an interactive graph, Flowsint allows users to quickly identify patterns, associations, and investigative leads that might be difficult to detect through traditional data analysis methods. The system includes automated enrichers that gather additional intelligence about entities such as domain records, social media profiles, network infrastructure, and cryptocurrency activity. Its modular architecture separates the frontend application, API server, core services, and enrichment modules, making the platform extensible and easier to expand with new investigative capabilities. -
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GOAD (Game of Active Directory)
game of active directory
GOAD (Gather Open Attack Data) is a security reconnaissance framework for collecting, enriching, and visualizing open-source intelligence (OSINT) around hosts, domains, and certificates. It automates queries to certificate transparency logs, passive DNS, subdomain enumeration, web endpoints, and other public threat feeds. The tool aggregates results into structured formats and can produce interactive graphs to highlight relationships between entities (e.g. domain → IP → cert → ASN). Analysts can filter, cluster, and explore these relationships to identify infrastructure patterns, potential subdomains, or attack surfaces. Integrations may include metadata like geolocation, WHOIS, and risk scoring to prioritize leads. GOAD helps teams transition from fragmented OSINT tools to a unified reconnaissance dashboard where exploration and filtering are first-class. -
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GoSpider
Gospider - Fast web spider written in Go
GoSpider - Fast web spider written in Go. Fast web crawling. Brute force and parse sitemap.xml. Parse robots.txt. Generate and verify link from JavaScript files. Link Finder. Find AWS-S3 from response source. Find subdomains from the response source. Get URLs from Wayback Machine, Common Crawl, Virus Total, Alien Vault. Format output easy to Grep. Support Burp input. Crawl multiple sites in parallel. -
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Google Authenticator OpenSource
Open source version of Google Authenticator (except the Android app)
Google Authenticator is the open-source counterpart of Google’s one-time passcode apps, implementing industry-standard OATH algorithms such as TOTP (time-based) and HOTP (counter-based) for two-factor authentication. The repository historically hosts code for mobile platforms like iOS and BlackBerry, demonstrating how to generate numeric codes locally without needing network access. Its core purpose is to help services and users add a second factor that’s simple to deploy yet resistant to password reuse and phishing. The app flow revolves around enrolling secrets via QR codes or manual entry, storing them securely on-device, and rendering rotating codes synchronized by time. Because it uses open standards, it interoperates with virtually any service that supports TOTP/HOTP, not just Google properties. The project also serves as a reference for implementers who want to understand enrollment UX, secret provisioning, and code generation at the application layer. -
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Hoverfly
Lightweight service virtualization/ API simulation / API mocking tool
Hoverfly is a lightweight, open source API simulation tool. Using Hoverfly, you can create realistic simulations of the APIs your application depends on. Replace unreliable test systems and restrictive API sandboxes with high-performance simulations in seconds. Run on MacOS, Windows or Linux, or use native Java or Python language bindings to get started quickly. Simulate API latency or failure when required by writing custom scripts in the language of your choice. -
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IPRanges
Daily updated lists of cloud, bot, and service IP ranges
ipranges is an open source repository that provides continuously updated lists of IP address ranges associated with major cloud providers, search engine crawlers, and online services. ipranges collects IP ranges from publicly available sources and organizes them into structured files that can be easily used in security, networking, and automation workflows. It includes address ranges from providers such as Google Cloud, Amazon AWS, Microsoft, Oracle Cloud, and DigitalOcean, as well as well known service platforms like GitHub, Facebook, Twitter, and Telegram. It also tracks IP ranges used by search engine bots and automated agents including Googlebot, Bingbot, and OpenAI’s GPTBot. Lists are published in both IPv4 and IPv6 formats and are regularly updated through automated processes to keep the data current. In addition to provider specific lists, the project also offers merged and combined datasets that aggregate ranges from multiple sources into a single file. -
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Luci App For Clash
Luci interface for Clash Openwrt
A rule-based custom proxy client for Openwrt based on Clash. -
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NPS
Lightweight, high-performance, powerful intranet penetration proxy
NPS is a lightweight, high-performance, powerful intranet penetration proxy server, with a powerful web management terminal. Comprehensive protocol support, compatible with almost all commonly used protocols, such as tcp, udp, http(s), socks5, p2p, http proxy. Full platform compatibility (linux, windows, macos, Synology, etc.), support installation as a system service simply. Comprehensive control, both client and server control are allowed. Https integration, support to convert backend proxy and web services to https, and support multiple certificates. Just simple configuration on web ui can complete most requirements. Complete information display, such as traffic, system information, real-time bandwidth, client version, etc. Powerful extension functions, everything is available (cache, compression, encryption, traffic limit, bandwidth limit, port reuse, etc.) Domain name resolution has functions such as custom headers, 404 page configuration, host modification, etc. -
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OWASP WrongSecrets
Vulnerable app with examples showing how to not use secrets
Welcome to the OWASP WrongSecrets game! The game is packed with real life examples of how to not store secrets in your software. Each of these examples is captured in a challenge, which you need to solve using various tools and techniques. Solving these challenges will help you recognize common mistakes & can help you to reflect on your own secrets management strategy.
