platform: jvm
3641 products, primary matches first, then adoption-weighted; health v2 shown.
| Product | Health v2 | Stars | Maturity |
|---|---|---|---|
| frohoff/ysoserial ysoserial is a proof-of-concept command-line tool that generates serialized Java payloads exploiting unsafe object deserialization using ga… | 48 | 9033 | active |
| checkstyle/checkstyle Checkstyle is a static analysis tool that checks Java source code against configurable coding standards and style rules, such as naming, im… | 99 | 9002 | active |
| Delta Lake Delta Lake is an open-source storage framework and table format that brings ACID transactions, scalable metadata handling, schema enforceme… | 95 | 8960 | stable |
| zhoutaoo/SpringCloud Opensabre is a microservices development platform built on Spring Cloud 2023, integrating Spring Security, Spring Cloud Alibaba (Nacos, Sen… | 76 | 8935 | active |
| java-native-access/jna Java Native Access (JNA) is a Java library that lets Java programs call native shared libraries (C/C++) using only Java code, without writi… | 75 | 8930 | stable |
| karatelabs/karate Karate is an open-source Java-based test automation framework that unifies API testing (REST, GraphQL, SOAP, WebSocket), UI browser automat… | 99 | 8929 | active |
| iflytek/astron-agent Astron Agent is an enterprise-grade, commercial-friendly agentic workflow platform for building, orchestrating, and deploying multi-agent A… | 83 | 8911 | active |
| twitter/finagle Finagle is an extensible, fault-tolerant, protocol-agnostic RPC system for the JVM, written in Scala with idiomatic APIs for both Scala and… | 66 | 8864 | stable |
| apache/shenyu Apache ShenYu is a Java-native, asynchronous, high-performance API gateway for service proxying, protocol conversion, and API governance ac… | 88 | 8820 | stable |
| aeron-io/aeron Aeron is an efficient, reliable message transport supporting UDP unicast, UDP multicast, and IPC, with Java, C, and C++ clients. It include… | 99 | 8818 | stable |
| Testcontainers Testcontainers is a family of libraries (Java, Go, .NET, Rust, and more) that provides lightweight, throwaway Docker containers for use in … | 93 | 8720 | stable |
| amitshekhariitbhu/Android-Debug-Database An Android library that lets developers debug SQLite databases and SharedPreferences directly from a web browser while the app runs on a de… | 52 | 8679 | stable |
| apache/beam Apache Beam is an open-source unified programming model and SDK set (Java, Python, Go, SQL, TypeScript) for defining batch and streaming da… | 93 | 8650 | stable |
| Tsunami Security Scanner Tsunami is a general-purpose network security scanner from Google that detects high-severity vulnerabilities with high confidence. It relie… | 74 | 8606 | active |
| florisboard/florisboard FlorisBoard is a free and open-source keyboard app for Android 8.0+ built in Kotlin, focused on being modern, customizable, and privacy-res… | 85 | 8595 | active |
| dropwizard/dropwizard Dropwizard is a Java framework that bundles stable libraries (Jetty, Jersey, Jackson, Logback, Metrics, JDBI/Hibernate, Liquibase) into an … | 95 | 8577 | stable |
| WildFire IM Wildfire IM is a professional-grade instant messaging and real-time audio/video solution with a Java-based IM server, push/robot/app server… | 94 | 8542 | active |
| yangzongzhuan/RuoYi RuoYi is a lightweight Java rapid development framework and admin management system built on Spring Boot, MyBatis, and Shiro. It ships with… | 82 | 8511 | active |
| DImuthuUpe/AndroidPdfViewer An Android library for displaying PDF documents in apps, built on PdfiumAndroid for decoding. It supports animations, gestures, zoom, and d… | 55 | 8470 | active |
| hs-web/hsweb-framework hsweb is a fully reactive enterprise backend management framework built on Spring Boot 2.x, Spring WebFlux, and R2DBC. It provides modular … | 74 | 8401 | active |
| pentaho/pentaho-kettle Pentaho Data Integration (Kettle) is an open-source ETL application for designing and running data extraction, transformation, and loading … | 67 | 8382 | active |
| Pokedex A Pokedex Android app demonstrating modern Android development with Hilt, Coroutines, Flow, Jetpack (Room, ViewModel), Material Motion, and… | 71 | 8353 | active |
| javalin/javalin Javalin is a lightweight, simple web framework for Java and Kotlin built on top of Jetty, supporting REST APIs, WebSockets, static file ser… | 98 | 8340 | active |
| bytedeco/javacv JavaCV is a Java library that wraps OpenCV, FFmpeg, and other computer vision and multimedia libraries via JavaCPP Presets, with utility cl… | 86 | 8335 | active |
| alibaba/transmittable-thread-local TransmittableThreadLocal (TTL) is a zero-dependency Java library providing an enhanced InheritableThreadLocal that transmits context values… | 62 | 8293 | stable |
| jeecgboot/jimureport JimuReport is a free Java-based reporting and data visualization platform with an Excel-like web designer for complex reports, printing, da… | 94 | 8235 | active |
| apache/tomcat Apache Tomcat is an open-source servlet container implementing the Jakarta Servlet, Pages, Expression Language, WebSocket, Annotations, and… | 77 | 8234 | stable |
| apache/shardingsphere-elasticjob Apache ElasticJob is a distributed scheduled job framework for the JVM that provides flexible scheduling, job sharding, and resource manage… | 76 | 8209 | stable |
| thoughtbot/factory_bot factory_bot is a Ruby library for defining and building test data objects with a straightforward factory definition syntax. It supports mul… | 89 | 8169 | stable |
| loks666/get_jobs An AI-powered job application assistant that automatically submits resumes across Chinese job platforms (Boss Zhipin, 51job, Liepin, Zhaopi… | 51 | 8166 | active |
| google/diff-match-patch A multi-language library (C++, C#, Dart, Java, JavaScript, Lua, Objective-C, Python) implementing robust algorithms for diffing, fuzzy matc… | 10 | 8140 | stable |
| Graylog2/graylog2-server Graylog is a free and open log management platform for collecting, storing, searching, and analyzing log data from across IT environments, … | 77 | 8115 | stable |
| davemorrissey/subsampling-scale-image-view An Android library providing a highly configurable, extendable image view for displaying very large images with deep zoom support. It uses … | 23 | 8006 | stable |
| freeok/so-novel So Novel is a Java-based tool for extracting structured content from web pages and exporting it as EPUB, TXT, or PDF ebooks. It offers CLI,… | 94 | 7943 | active |
| uber/RIBs RIBs is Uber's cross-platform mobile architecture framework built around Router, Interactor, and Builder components. It structures large mo… | 86 | 7933 | stable |
| PhilJay/MPAndroidChart MPAndroidChart is a powerful and easy-to-use chart and graph view library for Android, supporting line, bar, pie, radar, bubble, and candle… | 34 | 38193 | maintenance |
| dropwizard/metrics Dropwizard Metrics is a Java library for capturing JVM- and application-level metrics such as gauges, counters, histograms, and timers. It … | 88 | 7843 | stable |
| Tencent/Shadow Shadow is Tencent's open-source Android plugin framework that allows loading dynamically delivered plugin APKs without reflection or hidden… | 56 | 7786 | active |
| PowerJob/PowerJob PowerJob is an open-source enterprise job scheduling and distributed computing framework written in Java. It provides a web console, multip… | 56 | 7783 | active |
| facebook/litho Litho is a declarative UI framework from Facebook for building efficient Android user interfaces using immutable components and a functiona… | 67 | 7777 | active |
| MinecraftForge/MinecraftForge MinecraftForge is the long-standing modding framework and API for Minecraft, providing patched base game files, event systems, registries, … | 76 | 7760 | active |
| github/scientist Scientist is a Ruby library for carefully refactoring critical code paths by running old and new implementations side by side in production… | 47 | 7754 | stable |
| CeuiLiSA/Pixiv-Shaft PixShaft (Shaft) is an open-source third-party Pixiv client for Android built in Kotlin. It provides access to illustrations, manga, novels… | 95 | 7691 | active |
| MapStruct MapStruct is a Java annotation processor that generates type-safe, high-performance bean mapping code at compile time, supporting beans, re… | 77 | 7682 | stable |
| dependency-check/DependencyCheck OWASP Dependency-Check is a Software Composition Analysis (SCA) tool that identifies publicly disclosed vulnerabilities (CVEs) in a project… | 98 | 7671 | active |
| swagger-api/swagger-core Swagger Core is a Java library that implements the OpenAPI Specification, generating OpenAPI 3.x definitions from JAX-RS (javax and jakarta… | 99 | 7531 | stable |
| kevin-wayne/algs4 The official Java source code and libraries accompanying the textbook 'Algorithms, 4th Edition' by Sedgewick and Wayne, packaged as edu.pri… | 60 | 7519 | stable |
| h2oai/h2o-3 H2O-3 is an open-source, distributed, in-memory machine learning platform implementing algorithms such as GLM, GBM/XGBoost, Random Forest, … | 77 | 7494 | stable |
| logisim-evolution/logisim-evolution Logisim-evolution is a free, open-source, cross-platform Java application for designing and simulating digital logic circuits. It offers an… | 81 | 7488 | active |
| Morphe Morphe is an open-source Android app patcher that modifies APKs of apps like YouTube, YouTube Music, and Reddit to add features such as ad … | 83 | 7487 | active |
| jepsen-io/jepsen Jepsen is a Clojure library and framework for verifying the correctness of distributed systems under fault injection. It sets up systems on… | 89 | 7481 | active |
| enso-org/enso Enso Analytics is a self-service data preparation and analysis platform for data teams, built on a hybrid visual/textual functional program… | 91 | 7439 | active |
| gocd/gocd GoCD is an open-source continuous integration and continuous delivery (CI/CD) server that automates and visualizes build-test-release pipel… | 88 | 7430 | stable |
| apache/hertzbeat Apache HertzBeat is an AI-powered, agentless open-source real-time observability system that unifies metrics collection, log aggregation, a… | 84 | 7378 | active |
| abel533/Mapper A MyBatis extension library (tk.mybatis Common Mapper) that provides ready-made generic single-table CRUD methods so developers can avoid w… | 86 | 7359 | active |
| Col-E/Recaf Recaf is a modern Java bytecode editor with a JavaFX GUI that abstracts away low-level class file complexities like constant pools and stac… | 69 | 7355 | active |
| wiremock/wiremock WireMock is a popular open-source tool for mocking HTTP-based APIs, runnable as an embedded Java library, standalone server, or container. … | 80 | 7348 | stable |
| Droid-ify/client Droid-ify is a clutter-free, open-source F-Droid client for Android written in Kotlin. It lets users browse, install, and auto-update apps … | 95 | 7318 | active |
| technomancy/leiningen Leiningen is the classic build and project automation tool for Clojure, handling project scaffolding, dependency management, testing, REPL … | 78 | 7296 | stable |
| Alluxio/alluxio Alluxio is an open-source distributed caching and data orchestration platform that sits between compute frameworks (Spark, Presto, Trino, P… | 31 | 7231 | stable |
| google/error-prone Error Prone is Google's static analysis tool that hooks into the Java compiler to catch common programming mistakes as compile-time errors.… | 95 | 7225 | active |
| OpenXiangShan/XiangShan XiangShan is an open-source high-performance RISC-V processor core written in Chisel (Scala). It serves as both an industrial-grade CPU des… | 77 | 7213 | active |
| rikkahub/rikkahub RikkaHub is a native Android LLM chat client built with Kotlin and Jetpack Compose that supports switching between multiple AI providers su… | 83 | 7196 | active |
| didi/KnowStreaming Know Streaming is a cloud-native Kafka management and control platform built from years of operational experience at Didi. It provides zero… | 87 | 7177 | active |
| rest-assured/rest-assured REST Assured is a Java DSL for testing and validating REST APIs with a fluent, dynamic-language-style syntax. It supports request specifica… | 74 | 7138 | active |
| zxing/zxing ZXing ('Zebra Crossing') is an open-source, multi-format 1D/2D barcode image processing library implemented in Java, with ports to other la… | 73 | 34077 | maintenance |
| LibChecker/LibChecker An Android app that inspects libraries, native ABIs, permissions, components, and signing details of installed apps and APK files. It also … | 84 | 7117 | active |
| vespa-engine/vespa Vespa is an open-source, distributed AI search platform and serving engine that combines full-text search, vector/tensor search, and machin… | 95 | 7069 | stable |
| alibaba/easyexcel EasyExcel is a Java library for reading and writing Excel files (xls, xlsx, and CSV) built on top of Apache POI, redesigned to avoid out-of… | 10 | 33663 | maintenance |
| JUnit JUnit is the standard programmer-friendly testing framework for Java and the JVM, composed of the JUnit Platform (test launcher foundation)… | 98 | 7041 | stable |
| detekt/detekt detekt is a static code analysis tool for the Kotlin programming language that detects code smells and enforces configurable rule sets. It … | 70 | 7034 | active |
| paper-trail-gem/paper_trail PaperTrail is a Ruby gem that tracks changes to Rails ActiveRecord models, recording every create, update, and destroy as versioned snapsho… | 59 | 7032 | stable |
| snowplow/snowplow Snowplow is a Customer Data Infrastructure platform that collects, validates, enriches, and streams event-level behavioral data from web, m… | 63 | 7029 | stable |
| mrniko/netty-socketio A Java implementation of the Socket.IO server built on the Netty framework, supporting Socket.IO client versions 1.x through 4.x. It provid… | 55 | 7019 | stable |
| lance-format/lance Lance is an open lakehouse data format (file format, table format, and catalog spec) for multimodal AI, implemented in Rust with Python and… | 94 | 6973 | active |
| gatling/gatling Gatling is an open-source, code-first load testing tool and performance engineering platform. It uses a fully asynchronous, non-blocking ar… | 77 | 6953 | stable |
| JVM-Sandbox JVM-Sandbox is a real-time, non-invasive AOP framework container for the JVM, built on Java Instrumentation to dynamically enhance methods … | 48 | 6953 | active |
| SpringBlade SpringBlade is an enterprise-grade microservices development platform built on Spring Boot 4, Spring Cloud 2025, and Java 21, with a compan… | 93 | 6931 | active |
| HaxeFoundation/haxe Haxe is an open-source, high-level, strictly typed programming language and cross-compiler toolkit that compiles to many targets including … | 67 | 6918 | stable |
| getActivity/AndroidProject AndroidProject is a mature Android 'technology middle platform' — a pre-built project architecture template with common screens, dialogs, b… | 73 | 6912 | active |
| raphw/byte-buddy Byte Buddy is a Java library for generating and modifying Java classes at runtime without a compiler, offering a fluent API for creating ar… | 98 | 6887 | stable |
| sqldelight/sqldelight SQLDelight is a Kotlin code generation tool that produces typesafe APIs from SQL statements. It verifies schemas, queries, and migrations a… | 82 | 6865 | active |
| getActivity/XXPermissions XXPermissions is an Android runtime permission request framework written in Java that simplifies requesting normal and special permissions … | 91 | 6798 | active |
| jOOQ/jOOQ jOOQ is a Java library that models SQL as a type-safe internal DSL, with a source code generator that reverse-engineers your database schem… | 94 | 6777 | stable |
| quartz-scheduler/quartz Quartz is a richly featured, open-source job scheduling library for Java applications, supporting simple to complex schedules for thousands… | 85 | 6749 | stable |
| Yin-Hongwei/music-website A full-stack music streaming website built with Vue 3 + TypeScript on the frontend and Spring Boot + MyBatis with MySQL on the backend. It … | 75 | 6747 | active |
| ktlint/ktlint Ktlint is an opinionated Kotlin linter with a built-in formatter that enforces a standard code style without configuration. It supports .ed… | 80 | 6735 | active |
| nayuki/QR-Code-generator A high-quality QR Code generator library implemented independently from the ISO/IEC 18004 (QR Code Model 2) specification, available in Jav… | 79 | 6728 | stable |
| pig-mesh/pig Pig is an enterprise-grade RBAC rapid development platform built on Spring Cloud, Spring Boot 4, and OAuth2 (Spring Authorization Server), … | 86 | 6675 | active |
| apache/zeppelin Apache Zeppelin is a web-based notebook for interactive, data-driven analytics and collaborative documents. It supports SQL, Scala, Python,… | 77 | 6655 | stable |
| graphhopper/graphhopper GraphHopper is a fast, memory-efficient open source routing engine for OpenStreetMap (and GTFS) data, usable as a Java library or standalon… | 74 | 6644 | stable |
| gephi/gephi Gephi is an open-source desktop application for interactive visualization and analysis of large graphs and networks, built on Java and the … | 94 | 6622 | active |
| gotson/komga Komga is a self-hosted media server for comics, mangas, BDs, magazines and eBooks (CBZ/CBR, EPUB, PDF). It provides a responsive web UI, we… | 98 | 6604 | active |
| Hazelcast Hazelcast is a unified real-time data platform combining distributed stream processing with a fast, in-memory data store. It lets applicati… | 82 | 6604 | stable |
| jetlinks/jetlinks-community JetLinks is an open-source, fully reactive enterprise IoT platform built on Java 17, Spring Boot 3.x, WebFlux, Netty, and Reactor. It provi… | 72 | 6593 | active |
| Javen205/IJPay IJPay is a lightweight Java payment SDK that wraps WeChat Pay, Alipay, QQ Pay, JD Pay, UnionPay, and PayPal into a unified, framework-agnos… | 30 | 6582 | active |
| arrow-kt/arrow Arrow is a Kotlin library for typed functional programming, providing data types like Option and Either, typed error handling with the Rais… | 91 | 6580 | active |
| plainhub/plain-app PlainApp is an open-source Android app that runs a local web server on your phone, letting you manage files, media, contacts, SMS, notes, a… | 99 | 6578 | active |
| EsotericSoftware/kryo Kryo is a fast and efficient binary object graph serialization framework for Java with an easy-to-use API. It also supports automatic deep … | 79 | 6546 | stable |
| alibaba/p3c Alibaba's Java Coding Guidelines implemented as PMD rules plus IntelliJ IDEA and Eclipse plugins. It enforces Alibaba's internal Java best … | 32 | 30850 | maintenance |