Open Source Java Software - Page 57
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Java Software
Browse free open source Java Software and projects below. Use the toggles on the left to filter open source Java Software by OS, license, language, programming language, and project status.
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KryptEY
Android keyboard for secure E2EE communication
KryptEY is a secure, privacy‑focused Android keyboard that implements the Signal Protocol (X3DH + Double Ratchet) directly in the keyboard layer. It enables end-to-end encrypted messaging within any app—without relying on external servers—ensuring that key exchanges and message encryption happen locally, maintaining Signal-level security across platforms. -
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Let
Annotation based API flavored with AOP to handle Android models
Annotation-based simple API flavored with AOP to handle new Android runtime permission model. If you check Google's Samples about the new permission model, you'll see a lot of boilerplate code for requesting, handling, and retrying the request for required permissions. Let will minimize the boilerplate code you have to write for requesting and handling permissions and hence help you keep your code more readable. Let will check these annotated methods and execute them unless the permissions required are granted; otherwise, Let will put on hold the method execution on and request these permissions at runtime. After examining the permission request result, Let will execute the method already put on hold only if the permissions are granted by user. -
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Light-4J
A fast, lightweight and more productive microservices framework
Light means lightweight, lightning-fast and shedding light on how to program with modern Java SE for cloud-native deployment. I had been working on the Java EE platforms since early 2000 and suffered performance and productivity issues. In 2014, I realized that the IT industry was moving from Monolithic to Microservices and from on-premise data centers to the public clouds. To reduce the production cost for my applications, I need to find a lightweight platform that has a small memory footprint, high throughput, and low latency in Java. Java EE and Spring/Spring Boot are too heavy to be considered. Other lightweight Java platforms all have different issues on the separation between the business logic and technical cross-cutting concerns. Moreover, they are not cloud-native or designed for container/cloud. -
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Lightweight-Stream-API
Stream API from Java 8 rewritten on iterators for Java 7 and below
Stream API from Java 8 rewritten on iterators for Java 7 and below. -
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Litho
A declarative framework for building efficient UIs on Android
Litho uses a declarative API to define UI components. You simply describe the layout for your UI based on a set of immutable inputs and the framework takes care of the rest. With code generation, Litho can perform optimisations for your UI under the hood, while keeping your code simple and easy to maintain. Litho can measure and layout your UI ahead of time without blocking the UI thread. By decoupling its layout system from the traditional Android View system, Litho can drop the UI thread constraint imposed by Android. Litho uses Yoga for layout and automatically reduces the number of ViewGroups that your UI contains. This, in addition to Litho's text optimizations, allows for much smaller view hierarchies and improves both memory and scroll performance. -
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Luck Perms
A permissions plugin for Minecraft servers
LuckPerms is a widely used open-source permissions management plugin for Minecraft servers that allows administrators to control what actions players can perform within the game. The plugin provides a flexible system for creating user groups, assigning permissions, and defining roles that determine access to commands, features, and gameplay mechanics. Designed for performance and scalability, LuckPerms can handle large multiplayer servers and complex permission hierarchies while maintaining fast response times. Administrators can configure permissions using command-line tools, configuration files, or a web-based editor that simplifies management of large permission systems. The plugin also supports multiple storage backends such as local files, SQL databases, and other data systems, allowing server networks to synchronize permissions across multiple servers. -
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ML Manager 1.X
A modern, easy and customizable app manager for Android with Material
A modern, easy and customizable APK extractor & app manager for Android that allows you to extract any installed and system app, mark them as favorite, share .apk files easily and much more. -
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Mall
Java-based e-commerce system with backend and frontend modules
The mall project is a comprehensive, full-featured e-commerce platform developed in Java, offering modules for product management, orders, users, promotions, and administration. Built with Spring Boot, MyBatis, and Vue.js, it provides a complete solution for developers looking to build or learn from a production-ready online shopping platform. It supports high scalability and clean architectural design suitable for enterprise-grade applications. -
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Matisse
A well-designed local image and video selector for Android
Matisse is a well-designed local image and video selector for Android. If you use Glide as your image engine, add rules as Glide's README says. If you use Picasso as your image engine, add rules as Picasso's README says. There are two built-in themes you can use to start MatisseActivity, which are R.style.Matisse_Zhihu (light mode), and R.style.Matisse_Dracula (dark mode). All images and videos will be shown in Matisse by default, you can't limit the selectable mime types. You can launch Matisse from Activity or Fragment. Meanwhile you should receive results in the corresponding onActivityResult() callback. If you want a fixed span count, you can do it. The span count will stay the same when orientation changes. If you expect a grid size which will be flexible fitting different screens, you can also pull that off. This value won't necessarily be applied cause the photo grid should fill the view container. -
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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Metrics
Capturing JVM and application-level metrics
Metrics is a Java library which gives you unparalleled insight into what your code does in production. Metrics provides a powerful toolkit of ways to measure the behavior of critical components in your production environment. With modules for common libraries like Jetty, Logback, Log4j, Apache HttpClient, Ehcache, JDBI, Jersey and reporting backends like Graphite, Metrics provides you with full-stack visibility. The central library for Metrics is metrics-core, which provides some basic functionality. The starting point for Metrics is the MetricRegistry class, which is a collection of all the metrics for your application (or a subset of your application). Each metric is associated with a MetricRegistry, and has a unique name within that registry. A gauge is the simplest metric type. It just returns a value. If, for example, your application has a value which is maintained by a third-party library, you can easily expose it by registering a Gauge instance which returns that value. -
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Mongock
Lightweight Java based migration tool
Mongock is a Java-based database migration tool specifically designed for MongoDB, enabling version-controlled schema changes in a safe and efficient manner. -
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MyBatis Mapper4
Mybatis common mapper, easy to use
This book starts with a simple MyBatis query to build a basic development environment for learning MyBatis. Through a comprehensive sample code and test, the basic usage of adding, deleting, modifying, and checking operations in the MyBatis XML mode and annotation mode is explained, and the application of dynamic SQL in different aspects and the best practice program in the use process are introduced. Provides a wealth of examples for MyBatis advanced mapping, stored procedures, and type processors. Through a bottom-up approach, readers can better understand and master the advanced usage of MyBatis. At the same time, a detailed configuration introduction is provided for the code generator of MyBatis. . In addition, the book also provides detailed content for cache configuration, plug-in development, Spring, and Spring Boot integration. Finally, we introduce Git and GitHub to let readers understand the MyBatis open source project. -
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Nakadi
A distributed event bus that implements a RESTful API abstraction
Nakadi is a real-time event streaming platform developed by Zalando, built to handle publish-subscribe use cases at scale. It abstracts Kafka and provides a RESTful API to manage event types, producers, and consumers. Nakadi is aimed at simplifying event-driven architecture for microservices and distributed systems. -
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Netty-socketio
Socket.IO server implemented on Java
This project is an open-source Java implementation of Socket.IO server. Based on Netty server framework. Supports 0.7...0.9.16 (netty-socketio 1.6.6) and 1.0+ (netty-socketio latest version) version of Socket.IO-client. Supports distributed broadcast across netty-socketio nodes (Redisson, Hazelcast). Supports OSGi, supports Spring, lock-free and thread-safe implementation, and declarative handler configuration via annotations. YourKit is kindly supporting this open source project with its full-featured Java Profiler. YourKit, LLC is the creator of innovative and intelligent tools for profiling Java and .NET applications. CentOS, 1 CPU, 4GB RAM runned on VM, CPU 10%, Memory 15%, 6000 xhr-long polling sessions or 15000 websockets sessions, 4000 messages per second. -
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Nitrite Database
NoSQL embedded document store for Java
Nitrite is an embedded NoSQL database for Java applications, offering lightweight document storage with indexing and query capabilities. -
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Nukkit
Nuclear-Powered Minecraft: Bedrock Edition Server Software
Nukkit is nuclear-powered server software for Minecraft: Pocket Edition. It has a few key advantages over other server software. -
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OSS-Fuzz
OSS-Fuzz - continuous fuzzing for open source software
OSS-Fuzz is a large-scale fuzz testing platform developed by Google to improve the security and reliability of widely used open source software. Fuzz testing is a proven method for uncovering programming errors such as buffer overflows and memory leaks, which can lead to severe security vulnerabilities. By leveraging guided in-process fuzzing, Google has already identified thousands of issues in projects like Chrome, and this initiative extends the same capabilities to the broader open source community. OSS-Fuzz integrates modern fuzzing engines with sanitizers and runs them at scale in a distributed environment, providing automated testing and continuous monitoring. The platform supports multiple programming languages including C/C++, Rust, Go, Python, Java/JVM, and JavaScript, ensuring wide coverage across critical open source projects. -
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OneDev
Git Server with CI/CD, Kanban, and Packages
OneDev is a comprehensive Git server that combines source code management with built-in CI/CD, issue tracking, and project management tools. It offers an intuitive GUI for creating CI/CD jobs, supports versatile executors, and provides features like code search and navigation. OneDev aims to deliver a seamless integration experience for development teams. -
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OrientDB
DBMS supporting graph, document, full-text and geospatial models
OrientDB is an Open Source Multi-Model NoSQL DBMS with the support of Native Graphs, Documents, Full-Text search, Reactivity, Geo-Spatial and Object Oriented concepts. It's written in Java and it's amazingly fast. No expensive run-time JOINs, connections are managed as persistent pointers between records. You can traverse thousands of records in no time. Supports schema-less, schema-full and schema-mixed modes. Has a strong security profiling system based on user, roles and predicate security and supports SQL amongst the query languages. Thanks to the SQL layer it's straightforward to use for people skilled in the Relational world. OrientDB adheres to the NoSQL movement even though it supports ACID Transactions and SQL as query language. In this way it's easy to start using it without having to learn too much new stuff. -
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PRDownloader
A file downloader library for Android with pause and resume support
A file downloader library for Android with pause and resume support. PRDownloader can be used to download any type of files like image, video, pdf, apk and etc. This file downloader library supports pause and resume while downloading a file. Supports large file download. This downloader library has a simple interface to make download request. We can check if the status of downloading with the given download Id. PRDownloader gives callbacks for everything like onProgress, onCancel, onStart, onError and etc while downloading a file. Supports proper request canceling. Many requests can be made in parallel. All types of customization are possible. -
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PermissionsDispatcher
A declarative API to handle Android runtime permissions
PermissionsDispatcher provides a simple annotation-based API to handle runtime permissions. This library lifts the burden that comes with writing a bunch of check statements whether permission has been granted or not from you, in order to keep your code clean and safe. PermissionsDispatcher introduces only a few annotations, keeping its general API concise. Annotate a method that explains why the permissions are needed. It passes in a PermissionRequest object which can be used to continue or abort the current permission request upon user input. Annotate a method that is invoked if the user doesn't grant the permissions. Annotate a method that is invoked if the user chose to have the device "never ask again" about permission. Now generated functions become much more concise and intuitive than Java version! -
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PictureSelector
Picture Selector Library for Android
A PictureSelector for Android platform, which supports obtaining pictures, videos, audio & photos from photo albums, cutting (single picture or multi-picture cutting), compression, theme custom configuration and other functions, and supports dynamic access & an open-source picture selection framework suitable for Android 5.0 + system. -
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PolarDB-X
PolarDB-X is a cloud native distributed SQL Database
PolarDB-X is a cloud-native distributed SQL database designed to handle high concurrency, massive storage, and complex querying scenarios. It features a shared-nothing architecture that decouples computing from storage, providing scalability and flexibility for various applications. -
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Qigsaw
Dynamic modularization library which is based on Android App Bundles
Qigsaw is a dynamic modularization library which is based on Android App Bundles. It supports dynamic delivery for split APK without reinstalling the base one. Qigsaw-gradle-plugin will upload split APKs which require dynamic delivery during compilation, so you have to implement SplitApkUploader to upload split APKs to your own CND server. -
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RE2/J
linear time regular expression matching in Java
RE2/J is a high-performance regular expression engine implemented in pure Java as a port of Google’s C++ RE2 library. Unlike traditional regex engines such as Java’s java.util.regex, PCRE, or Perl’s implementation—which rely on backtracking and can suffer from catastrophic exponential runtimes—RE2/J guarantees linear-time matching relative to input size. It achieves this efficiency by simulating all possible matches in a single pass using a nondeterministic finite automaton (NFA), ensuring predictable and safe performance even with complex patterns. This makes RE2/J ideal for applications that must handle user-supplied regular expressions securely without the risk of denial-of-service through regex backtracking. While it omits some advanced features like backreferences and certain Java regex options, it supports the vast majority of practical expressions used in production code. RE2/J thus provides a reliable, safe, and scalable alternative for developers.
