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popular Java repos on github, each explained in plain english: what it does, its stack, and how to run it.

• ereza/customactivityoncrashCustomActivityOnCrash is an Android library that replaces the generic system crash popup with a custom screen
• termux/termux-apiAn Android app that lets Termux terminal scripts access phone hardware like the camera, GPS, SMS, and clipboar
• jtablesaw/tablesawTablesaw is a Java library for loading, cleaning, analyzing, and charting tabular data, similar to what pandas
• undertow-io/undertowUndertow is a high-performance Java web server with non-blocking I/O, full Servlet support, and WebSocket hand
• apache/tikaApache Tika is a Java library that pulls text and metadata out of hundreds of file formats — PDFs, Word docs,
• openhft/chronicle-queueChronicle Queue is a Java library for ultra-fast, broker-less persistent messaging that stores everything to d
• helloworld521/javaA personal collection of small Java practice projects covering common web development patterns like authentica
• dromara/liteflowLiteFlow is a Java framework that breaks complex business processes into small reusable components driven by r
• coderbruis/javasourcecodelearningA collection of in-depth notes and analysis articles on the internal source code of popular Java frameworks in
• lihangleo2/shadowlayoutAn Android Java library for adding customizable drop shadows, rounded corners, gradients, and tap-state effect
• datalinkdc/dinkyA browser-based platform for writing, testing, and managing Apache Flink SQL streaming jobs, with a built-in e
• yanzhenjie/nohttpAn Android networking library for Java that handles HTTP requests, file uploads, response caching, and cookie
• irisshaders/irisAn open-source Minecraft mod that adds shader pack support for realistic visual effects like water reflections
• roboguice/roboguiceA retired (2016) Android library that automatically supplied apps with views, resources, and system services u
• stfalcon-studio/chatkitAn Android library that provides three ready-made, fully customizable chat UI components — a conversations lis
• ethanhua/skeletonAndroid library that shows shimmering grey placeholder shapes while your app loads data, giving users a sense
• andotp/andotpOpen-source Android app that generates two-factor authentication codes for your online accounts, stores them e
• fasterxml/jackson-databindThe most widely used Java library for converting between Java objects and JSON, with a simple ObjectMapper API
• haleydu/cimocAn Android app for reading manga online, pulling chapters from third-party sites with offline downloads and cl
• 1024-lab/smart-adminA production-ready Chinese enterprise admin platform with Spring Boot backend, Vue 3 frontend, built-in role-b
• grpc-ecosystem/grpc-springA library that automatically wires gRPC — Google's fast service-to-service communication protocol — into a Spr
• liuyubobobo/play-with-algorithmsThe companion code repository for a Chinese imooc.com algorithms course, providing C++ and Java implementation
• springdoc/springdoc-openapiA Java library that automatically generates interactive API documentation for Spring Boot apps without any man
• willowtreeapps/spruce-androidAn Android Java library that coordinates animations across multiple views at once, handling order, timing, and
• microservices-patterns/ftgo-applicationFTGO is the companion code for the book Microservice Patterns, showing a Java food-delivery app split into mic
• bytelegend/bytelegendByteLegend is a free browser-based multiplayer RPG where you learn real programming skills by completing in-ga
• dingjikerbo/android-bluetoothkitAndroid-BluetoothKit is a Java library that simplifies Bluetooth Low Energy communication on Android, smoothin
• ryanhoo/stylishmusicplayerOpen-source Android music player app with a Material Design look, written in Java for Android 4.1 and later de
• tng/archunitArchUnit is a Java library that lets you write automated tests to enforce architecture rules in your codebase,
• mojang/brigadierBrigadier is Mojang's open-source Java library for parsing and dispatching commands using a tree structure, or
• oasisfeng/islandIsland is an Android app that acts as an open platform for device policy management, letting other developers
• mbechler/marshalsecA Java security research tool that generates test payloads to check whether your application's deserialization
• linkedin/databusAn open-source change-data-capture system from LinkedIn that watches a database's transaction log and streams
• networknt/light-4jA lightweight Java microservices framework designed to be 44x faster and use 5x less memory than Spring Boot.
• spring-io/initializrThe backend that powers start.spring.io: a REST API and website that generates ready-to-build Spring project s
• lisawray/groupieAn Android library that cuts the boilerplate out of building complex RecyclerView lists. Organize content into
• google/rejoinerA Java library that connects multiple gRPC/Protobuf backend services into a single GraphQL API, so front-end c
• yangfuhai/asimplecacheA single Java file that adds disk caching to Android apps, letting you store strings, JSON, images, and object
• kunminx/linkage-recyclerviewLinkage-RecyclerView is an Android library that adds a two-panel linked category-and-item list, like a food de
• fabric8io/kubernetes-clientA Java library with a readable, sentence-like syntax for controlling Kubernetes and OpenShift clusters from co
• huburt-hu/newbieguideAn Android library that adds a chainable, first-time-user onboarding overlay highlighting specific views with
• apache/incubator-heronAn Apache incubator project from Twitter for processing huge streams of real-time data, like tweets and clicks
• spockframework/spockA testing framework for Java and Groovy that writes tests as readable specifications with labeled sections and
• m66b/netguardA no-root Android app that lets you block or allow internet access per app, using a local on-device VPN with n
• litesuits/android-commonA lightweight (under 50KB) collection of ready-made Android utility classes for logging, image handling, netwo
• alibaba/alinkA machine learning algorithm library from Alibaba built on Apache Flink, offering classification, clustering,
• nekogram/nekogramNekogram is a modified Android build of the Telegram messaging app that adds a small set of extra features on
• netflix/concurrency-limitsA Java library that automatically adjusts how many concurrent requests a service handles, based on real-time l
• snailclimb/interview-guideAn open source AI platform for resume analysis, mock interviews with voice, and RAG powered interview prep.
• getactivity/multilanguagesAn Android framework that lets users switch the app's display language from inside the app, overriding the pho
• juanjuandog/finsight-aiAn open-source tool that turns company filings and market data into structured equity research reports with ra
• elder-plinius/v3sp3rAn Android app that lets you control a Flipper Zero hardware hacking device using natural language voice or te
• szili1994/create-aeronautics-minecraft-modA Minecraft mod addon that adds a physics engine to the Create mod, letting players build airships, planes, an
• getactivity/nestedscrolllayoutAn Android library that adds nested scrolling support to common layout components like WebView and LinearLayou
• 6537445/jenny-mod-minecraft-An unofficial Minecraft mod that adds an animated character with voice interactions, marked as adult content f
• clougence/open-cdmA free, team-oriented database management console with access control, SQL auditing, and change review workflo
• mollyiv/chatheadsA demo Android project showing how to create floating chat bubbles that sit on top of other apps, similar to F
• tensorflow/java-modelsA collection of ready-to-run Java examples showing how to build and run machine learning models like image rec
• zjuncher/xiaoyan-ai-dev-assistantA RAG-based AI assistant that lets development teams upload internal documents and ask questions in natural la
• pengmoubuaixuexi/tagentSpring Boot study project combining Auto and Flow style AI agents with MCP tools, hybrid RAG over pgvector and
• openysmdev/openysmOpen-source Minecraft Forge mod that replaces the player character with customizable Bedrock-format models and
• soapantelope/mindcraftA Minecraft mod that generates an entire playable world from a plain-text description you type, using an AI mo
• agarrharr/phonegap-sms-pluginA PhoneGap/Cordova plugin that lets cross-platform mobile apps send SMS text messages through the phone's nati
• getactivity/shapedrawableA Java tool for Android developers that lets them create custom-styled backgrounds for buttons and cards direc
• redis/docsThe source files and site-building tools behind the official Redis documentation website at redis.io.
• shivambansal96/vce_hydA 12-day Java course covering Data Structures and Algorithms for engineering students, with daily code files,
• striga-ai/cve-2026-34486A proof of concept that shows how a flawed encryption check in Apache Tomcat clustering lets an attacker run c
• floxu1/uac-sni-spoofer-androidAn Android app that disguises which website you're connecting to, using SNI spoofing and a proxy tunnel, to ge
• margele/openzenA work-in-progress reverse-engineered open-source version of the Zen Minecraft cheat client for 1.20.1 Forge,
• jdubois/boot-uiA plug-in for Spring Boot 4 Java applications that adds a local developer dashboard inside the running app, sh
• saidsurucu/ude-mac-arm64A patch that repackages a Turkish government document editor to run natively on Apple Silicon Macs, restoring
• happynewyear1995/uba-xUBA-X is a self-hosted enterprise user behavior analytics platform that collects events from websites and apps
• zjuncher/yunqi-youxiangA Java learning project simulating a local services app, showing how to build flash sale, caching, and rate li
• kcpeppe/gcsee-jmaA Quarkus web app that turns a Java garbage collection log into an interactive dashboard of charts and analyti
• bigchuidw3/spring-ai-agentxA Java framework built on Spring AI for creating AI agents, providing tool calling, layered memory, and human-
• lywnl/ai-app-generationSpring Boot platform that turns a natural-language prompt into a deployable web app, picking between single HT
• bell11213442/ruby-clientA Java-based Minecraft client for the Fabric mod loader, with almost no README content beyond a link to a sepa
• motao123/webtvAn Android and Android TV video player shell that connects to JSON config files you provide, with sync between
• sfee1212/moyutvAn Android TV app for watching IPTV channels from playlist files, with dual video engines and program guide ma
• magic-meet/retrieve-pro-plusA self-hosted system for uploading, parsing, and searching academic PDF papers with keyword, semantic, and hyb
• ispointer/repairipA Java command line tool for merging, patching, and rebuilding Android APKs protected by Google Play's PairIP
• zerozshare/openfriendmodA Fabric mod that adds the newer Minecraft friends list, gamertag search, and Join feature to old Minecraft ve
• chrisjenx/androidtimelockA lightweight Android library that adds an expiration date to development or beta builds. After the set date p
• fish2018/webhtvAn Android video player app extending FongMi/CatVod with a customizable webpage-based home screen and a native
• woodpecker-appstore/ghost-bits-encoderA Woodpecker security-testing plugin that encodes text into unusual Unicode variants to help test for filter b
• ghuyphan/kiosk-browserAn Android kiosk app that locks a device into full screen browsing of one configured website, with remote curs
• awrsha/garden-remote-controllerAn Android app that controls and monitors IoT devices over SMS, with no internet connection required.
• icysymmetra/tiktok-patches-for-morpheA patch bundle for the Morphe Android app that modifies TikTok 43.8.3 to remove login walls, block ads and unw
• autismdevelopment/autism-clientA Java based Minecraft client described only as focused on exploit hunting and debugging, with almost no furth
• cheburnetik/autoconnector_for_telegramAutoConnector for Telegram automatically finds, tests, and connects you through the fastest free proxies so Te
• hfsecret/flowguardxFlowGuardX analyzes recorded network traffic files to detect threats like port scans, floods, and malware chec
• c1422113471-cpu/hermes-wechat-relayA plugin that lets WeChat messages flow into the Hermes AI agent platform as a separate, isolated input channe
• cornerdevice/checkappdeviceAn Android Xposed/LSPosed module called DeviceVeil that intercepts apps reading your device identifiers and re
• lourousa/frauddetectionA demo project showing how Apache Fluss, Flink, and Iceberg work together for real-time bank fraud detection w
• andrea-lyz/melodycodectweakerMelodyCodecTweaker is an Android module for OPPO and OnePlus phones that unlocks hidden Bluetooth audio settin
• fwilldev/portasplit-trackerA Java Spring Boot app that monitors availability of the Midea PortaSplit AC across German retail stores and A
• stpavel/tspu-probeAn Android app that diagnoses why a VPN connection is failing by stepping through each network layer in sequen
• darealneoncoder/minecraftinterminalA tiny Minecraft-style game rendered entirely with text characters in a terminal instead of 3D graphics.
• libambu/data-agentData Agent lets you ask data questions in plain text and returns working SQL or Python code plus a Markdown re
• sunjulei/warehouseA browser-based inventory management app for small businesses — track purchases, sales, returns, and stock lev

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