Open Source C Software - Page 42
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C Software
Browse free open source C Software and projects below. Use the toggles on the left to filter open source C Software by OS, license, language, programming language, and project status.
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Go from Code to Production URL in SecondsSkip the Kubernetes configs. Cloud Run handles HTTPS, scaling, and infrastructure automatically. Two million requests free per month.
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Fully Managed MySQL, PostgreSQL, and SQL ServerCloud SQL handles your database ops end to end, so you can focus on your app.
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APNG to GIF
Convert APNG animations into animated GIF format.
This program converts APNG animations into animated GIF format. Wu64 quantization is used for true-color files. Transparency is handled either using a threshold, or composed over chosen background color. CLI version is OS-independent, GUI version is available for Windows. Another converter: http://sourceforge.net/projects/gif2apng -
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mkahawa is a swahili word for Cafe. mkahawa builds on the small but fast Cafe Con Leche (CCL) - the light, but ultra-fast C++ Internet Cafe Management Software for Linux and Windows. This is but a continuation of CCL development in just another form.
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Foremost is a linux tool for conducting forensic examinations. Although intended for law enforcement purposes, it may be useful to other members of the community. Foremost reads through a file, such as a dd image file or a disk partition and extracts file
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Egoboo
Free 3D Roguelike action RPG
Egoboo is a working cool 3D dungeon crawling game in the spirit of nethack. Currently it is supported by Windows, Linux and Mac. -
Gemini 3 and 200+ AI Models on One PlatformBuild generative AI apps with Vertex AI. Switch between models without switching platforms.
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bftpd is an FTP server for Unix systems, which is designed to be portable and fast. It supports inetd and standalone mode, most RFC FTP commands and is very easy to configure.
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Alpaca.cpp
Locally run an Instruction-Tuned Chat-Style LLM
Run a fast ChatGPT-like model locally on your device. This combines the LLaMA foundation model with an open reproduction of Stanford Alpaca a fine-tuning of the base model to obey instructions (akin to the RLHF used to train ChatGPT) and a set of modifications to llama.cpp to add a chat interface. Download the zip file corresponding to your operating system from the latest release. The weights are based on the published fine-tunes from alpaca-lora, converted back into a PyTorch checkpoint with a modified script and then quantized with llama.cpp the regular way. -
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BinExport
Export disassemblies into Protocol Buffers
BinExport is a disassembly export plugin developed by Google as part of the BinDiff ecosystem, designed for reverse engineering and binary analysis. It works with popular disassemblers including IDA Pro, Binary Ninja, and Ghidra, enabling the export of disassembly data into a structured Protocol Buffer format. This exported data can then be used for binary comparison, diffing, and advanced analysis tasks through BinDiff or other compatible tools. BinExport captures detailed information such as instructions, functions, control flow graphs, and metadata, providing a machine-readable representation of a program’s disassembled structure. It supports multiple export formats, including binary, text, and statistics outputs, and can be used interactively or via scripting (IDC, IDAPython, or Ghidra’s headless mode). The project includes complete build instructions for Linux, macOS, and Windows, ensuring reproducibility across platforms. -
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C-ARES
A C library for asynchronous DNS requests
This is C-ARES, an asynchronous resolver library. It is intended for applications that need to perform DNS queries without blocking, or need to perform multiple DNS queries in parallel. The primary examples of such applications are servers that communicate with multiple clients and programs with graphical user interfaces. The full source code is available in the 'C-ARES' release archives. -
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Capstone
Capstone disassembly/disassembler framework
Capstone is a disassembly framework with the target of becoming the ultimate disasm engine for binary analysis and reversing in the security community. Created by Nguyen Anh Quynh, then developed and maintained by a small community, Capstone offers some unparalleled features. Support multiple hardware architectures: ARM, ARM64 (ARMv8), Ethereum VM, M68K, Mips, MOS65XX, PPC, Sparc, SystemZ, TMS320C64X, M680X, XCore and X86 (including X86_64). Having clean/simple/lightweight/intuitive architecture-neutral API. Provide details on disassembled instruction (called “decomposer” by others). Provide semantics of the disassembled instruction, such as list of implicit registers read & written. Implemented in pure C language, with lightweight bindings for D, Clojure, F#, Common Lisp, Visual Basic, PHP, PowerShell, Emacs, Haskell, Perl, Python, Ruby, C#, NodeJS, Java, GO, C++, OCaml, Lua, Rust, Delphi, Free Pascal & Vala (ready either in main code, or provided externally by the community). -
MongoDB Atlas runs apps anywhereMongoDB Atlas gives you the freedom to build and run modern applications anywhere—across AWS, Azure, and Google Cloud. With global availability in over 115 regions, Atlas lets you deploy close to your users, meet compliance needs, and scale with confidence across any geography.
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Crown Engine
The flexible game engine
Crown is a general-purpose and data-driven game engine, written in orthodox C++ with a minimalistic and data-oriented design philosophy in mind. Every aspect of the game is controlled through text configuration files. Before shipping, configuration files are compiled to efficient platform-specific binary blobs. Data in memory is organized to achieve the maximum performance possible on every platform. Every game asset is hot-reloadable, code included. Evaluate modifications and adjustments on-the-fly without having to reboot the game every time. Runs and looks equally well both on Linux and on Windows. Designed to be as fail-safe as possible to never lose your work if crashes should occur. Engine plus tools amounts to less than 50K LOC. Written in simple 'C-style' C++. It is easy for anyone to understand and make modifications. All the code is released under the very permissive MIT license and can be downloaded via GitHub by anyone. -
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DSVPN
A dead simple VPN
DSVPN is a Dead Simple VPN, designed to address the most common use case for using a VPN. Runs on TCP. Works pretty much everywhere, including on public WiFi where only TCP/443 is open or reliable. Uses only modern cryptography, with formally verified implementations. Small and constant memory footprint. Doesn't perform any heap memory allocations. Small (~25 KB), with an equally small and readable code base. No external dependencies. Works out of the box. No lousy documentation to read. No configuration file. No post-configuration. Run a single-line command on the server, a similar one on the client and you're done. No firewall and routing rules to manually mess with. Doesn't leak between reconnects if the network doesn't change. Blocks IPv6 on the client to prevent IPv6 leaks. Works on Linux (kernel >= 3.17), macOS and OpenBSD, as well as DragonFly BSD, FreeBSD and NetBSD in client and point-to-point modes. Adding support for other operating systems is trivial. -
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EDK II Project
EDK II
A modern, feature-rich, cross-platform firmware development environment for the UEFI and PI specifications. EDK II is a modern, feature-rich, cross-platform firmware development environment for the UEFI and PI specifications. EDK II is open source, using a BSD+Patent. Stable tags are created from edk2/master based on validation with various platforms. Stable tags names use the format edk2-stable<4 digit year><2 digit month> and occur roughly every three months (starting from August 2018). UEFI Development Kit (UDK) releases pre-date the introduction of the stable tag, occur less frequently, and have a longer validation cycle. These are based on validation using various platforms. The year tag indicates the year of major specifications used for the release. The majority of the content in the EDK II open source project uses a BSD-2-Clause Plus Patent License. -
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FLUX.2-klein-4B
Flux 2 image generation model pure C inference
FLUX.2-klein-4B is a compact, high-performance C library implementation of the Flux optimization algorithm — an iterative approach for solving large-scale optimization problems common in scientific computing, machine learning, and numerical simulation. Written with a strong emphasis on simplicity, correctness, and performance, it abstracts the core logic of flux-based optimization into a minimal C API that can be embedded in broader applications without pulling in heavy dependencies. Because the implementation is in plain C and focuses on data locality and vectorized operations, flux2.c can be integrated into performance-critical code paths where control over memory layout and execution behavior matters, such as GPU kernels, embedded systems, or custom ML runtime engines. -
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Gideros
Gideros Release version
Gideros is a cross-platform development environment for creating amazing games and interactive applications in 2D or 3D. It is easy to pick up, quick to develop, and robust to deploy. Code your game once and deploy it to Android, iOS, MacOS, tvOS, Windows, HTML 5, and more. Apart from supporting multiple platforms, Gideros also provides automatic screen scaling and automatic selection of proper image resolution, which makes supporting different screen resolutions, aspect ratios, and universal projects an easy task. You can easily extend the core with plugins. Import your existing (C, C++, Java or Obj-C) code, bind to Lua, and interpret them directly. Dozens of open-source plugins are already developed and ready to use: ads, in-app purchases, physics for 2d or 3d, Steam integration, and many more. -
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L-ink_Card
Smart NFC & ink-Display Card
L-ink Card is a smart NFC card with an electronic-ink display built into the card form-factor, aimed at solving everyday pain points of IC cards and giving them a “cooler” interface. The project uses an STM32L0-series microcontroller paired with an ST25DV NFC chip, an e-ink screen, and battery management so the card can display dynamic info while also serving as an NFC tag/card. Its functionality may include showing balance, last transaction, QR codes, or other custom info on the e-ink screen, and interfacing with smartphones or readers via NFC. Because it uses e-ink, the card can display static content with minimal power drain, making it practical for real-world card use. The repository includes board design files, firmware, and supporting software for customizing what the card shows. For hardware hackers and smart-card enthusiasts, it’s a fascinating hybrid of microcontroller, low-power display, and NFC tech in a familiar credit-card size. -
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LÖVR
Lua Virtual Reality engine
An open-source framework for rapidly building immersive 3D experiences. You can use LÖVR to easily create VR experiences without much setup or programming experience. The framework is tiny, fast, open-source, and supports lots of different platforms and devices. Runs on Windows, Mac, Linux, Android, WebXR. Supports Vive/Index, Oculus Rift/Quest, Pico, Windows MR, and has a VR simulator. Simple VR scenes can be created in just a few lines of Lua. Writen in C99 and scripted with LuaJIT, includes optimized single-pass stereo rendering. Out of the box you get fast stereo rendering, VR controllers, hand tracking, haptics, spatial audio, 3D physics, PBR materials, SDF fonts, multiplayer, and more. The entire engine is 1MB and runs on LuaJIT, the fastest JIT compiler round these parts. Projects are just folders with scripts and assets in them, organized however you want. -
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MentOS
An educational 32-bit linux-like Operating System
MentOS is an educational operating system developed for academic use, particularly in university settings, to help students understand low-level system concepts such as process management, memory handling, and scheduling. Written in C, MentOS closely mimics a simplified Unix-like OS and includes hands-on implementations of key kernel features. Designed to be highly readable and modular, it offers a practical approach to learning systems programming through real-world kernel components, making it a valuable tool for operating system courses and personal exploration. -
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Moonshine Voice
Fast and accurate automatic speech recognition (ASR) for edge devices
moonshine is an open-source automatic speech recognition toolkit optimized for fast and accurate transcription on edge devices and local environments. The project is designed to enable real-time voice applications such as live transcription, voice commands, and embedded speech interfaces without requiring heavy cloud infrastructure. Its architecture emphasizes low latency and flexible input handling, allowing audio streams of varying durations rather than relying on fixed processing windows. Moonshine supports multiple platforms including mobile, desktop, and embedded systems, and provides example projects to accelerate integration into real-world products. The toolkit also includes specialized model variants, including monolingual options that improve accuracy for specific languages. Overall, moonshine serves developers building privacy-conscious, on-device voice interfaces that demand high performance with minimal resource overhead. -
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OBS Linux Vulkan/OpenGL game capture
OBS Linux Vulkan/OpenGL game capture
obs-vkcapture is a Vulkan layer and OBS Studio plugin that enables capturing of Vulkan-rendered content in real time, solving a long-standing limitation in game recording and streaming. It works by injecting a Vulkan layer into applications, intercepting rendering calls, and redirecting frame data to OBS Studio without requiring special in-game support. This is particularly useful for modern Vulkan-based games or tools that lack native screen capture hooks. It’s lightweight, efficient, and actively maintained by the community. -
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Osquery
SQL operating system instrumentation and monitoring framework
Osquery is an operating system instrumentation framework for Windows, OS X (macOS), Linux, and FreeBSD. The tools make low-level operating system analytics and monitoring both performant and intuitive. Osquery exposes an operating system as a high-performance relational database. This allows you to write SQL queries to explore operating system data. With osquery, SQL tables represent abstract concepts such as running processes, loaded kernel modules, open network connections, browser plugins, hardware events or file hashes.Osquery queries your devices like a database. Osquery uses basic SQL commands to leverage a relational data-model to describe a device. Frequently, attackers will leave a malicious process running but delete the original binary on disk. This query returns any process whose original binary has been deleted, which could be an indicator of a suspicious process. -
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PicoLM
Run a 1-billion parameter LLM on a $10 board with 256MB RAM
PicoLM is an open-source inference framework designed to run large language models on extremely constrained hardware environments such as inexpensive single-board computers and embedded systems. The project focuses on enabling efficient local inference by optimizing memory usage, computation, and system dependencies so that relatively large models can operate on devices with minimal RAM. It is written primarily in C and designed with a minimalist architecture that removes unnecessary dependencies and external libraries. The runtime is capable of running language models with billions of parameters on devices with only a few hundred megabytes of memory, which is significantly lower than typical LLM infrastructure requirements. This makes PicoLM particularly suitable for edge computing, offline AI applications, and embedded AI devices that cannot rely on cloud resources. -
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PortableGL
An implementation of OpenGL 3.x-ish in clean C
PortableGL is a single-header, software-only implementation of a subset of OpenGL (specifically the GL 2.1 pipeline), designed to run entirely on the CPU. This lightweight graphics library allows OpenGL-style rendering without GPU acceleration, making it ideal for educational use, debugging, embedded systems, and retro-style software rendering. Because it mirrors OpenGL syntax and design, it can act as a drop-in CPU renderer for testing or deploying 3D graphics on platforms without GPU support. -
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Reality Mixer
Mixed Reality app for iOS
Reality Mixer lets you use your iPhone or iPad to capture your favorite VR games and applications in Mixed Reality without a PC and without a green screen. Reality Mixer is your new app for capturing your favorite virtual reality games and applications in Mixed Reality! Together with the iOS/iPadOS screen recording feature, you can use it to create Mixed Reality video recordings with or without a green screen, and without a PC. Compatible with the most popular virtual reality games and applications. You can use the screen recording button on the Control Center to record your Mixed Reality video or to use another app to stream the video. It includes options for hiding or filtering the "background layer", allowing you to create "augmented reality" recordings as well. Easy calibration with only 4 steps. 4 modes, Virtual Green Screen, Avatars, Green Screen, and Spectator. No green screen required (for devices with an A12 chip or newer). -
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Rofi
A window switcher, application launcher and dmenu replacement
Rofi started as a clone of the simple switcher, written by Sean Pringle - a popup window switcher roughly based on a super switcher. Simpleswitcher laid the foundations, and therefore Sean Pringle deserves most of the credit for this tool. Rofi (renamed, as it lost the simple property) has been extended with extra features, like an application launcher and ssh-launcher, and can act as a drop-in menu replacement, making it a very versatile tool. Rofi, like dmenu, will provide the user with a textual list of options where one or more can be selected. This can either be running an application, selecting a window, or options provided by an external script. It's not an application that can support every possible use case. It tries to be generic enough to be usable by everybody. Rofi has several built-in modes implementing common use cases and can be extended by scripts (either called from Rofi or calling Rofi) or plugins. -
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Taisei Project
A free and open-source Touhou Project fangame
Taisei is a free, open-source clone of the Touhou Project bullet hell shoot-'em-up games, written entirely from scratch. It aims to be a faithful recreation of the classic Touhou gameplay experience, complete with original assets that capture the aesthetics and charm of the original series. Built using portable and modern tools, it runs across platforms including Linux, Windows, macOS, and even web browsers via WebGL. The game is designed with accessibility and modding in mind, making it an appealing entry point for both players and developers.
