whatisgithub

Popular Java repositories on GitHub, each answered in plain English for non-coders: what it is, its tech 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
• spockframework/spockA testing framework for Java and Groovy that writes tests as readable specifications with labeled sections and
• juanjuandog/finsight-aiAn open-source tool that turns company filings and market data into structured equity research reports with ra
• 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
• 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
• agarrharr/phonegap-sms-pluginA PhoneGap/Cordova plugin that lets cross-platform mobile apps send SMS text messages through the phone's nati
• margele/openzenA work-in-progress reverse-engineered open-source version of the Zen Minecraft cheat client for 1.20.1 Forge,
• happynewyear1995/uba-xUBA-X is a self-hosted enterprise user behavior analytics platform that collects events from websites and apps
• lywnl/ai-app-generationSpring Boot platform that turns a natural-language prompt into a deployable web app, picking between single HT
• 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
• 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
• cornerdevice/checkappdeviceAn Android Xposed/LSPosed module called DeviceVeil that intercepts apps reading your device identifiers and re
• 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
• 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
• hcrab/rtsbuildingMinecraft mod replacing first-person building with top-down resource management. Open a panel to place blocks
• meowdump/meowassistantAn Android app for rooted phones that adds Quick Settings tiles — screenshot, data toggle, caffeine mode — and
• qwe5283/floatstudyassistantAndroid app that helps students look up exam answers on XuexiTong by using accessibility services to read cont
• ajinkyagokhale/esp-flasher-javaA graphical desktop app for Windows and macOS that flashes firmware onto ESP32 and ESP8266 microcontrollers by
• takattowo/bootloaderspooferAn Android module that makes apps think your device has a locked bootloader by modifying the local attestation
• lorypage/open-aLeaked source code of a Minecraft cheat client called ArcaneNG for version 1.21.4, built on the Fabric modding
• kdn251/uva-1A collection of Java solutions to programming problems from UVa Online Judge, a competitive programming platfo
• rohan-paul/carousel-react-native-theme-nov_10_2019A pre-built carousel and swiper component for React Native apps, letting users swipe horizontally through imag
• psibi/speakexSpeakex is an Android app that converts typed or pasted text into spoken audio using your phone's built-in tex
• xingshaocheng/jcsproutA curated Java knowledge base covering concurrency, JVM internals, algorithms, and system design. It serves as
• kristitrnka/spectraAn experimental Minecraft Forge 1.12.2 mod that backports the Iris and Oculus shader system so older modpacks
• alexeygrigorev/codeforces-solutions-javaA personal archive of Java solutions to Codeforces competitive programming puzzles and university algorithm co
• alexeygrigorev/rseqRseq is a Java library for pattern-matching over sequences of objects, bringing regular-expression-like search
• hyperionelectronicsco/jarvisAn Android voice assistant with a futuristic animated HUD that responds to 'okay Jarvis' and controls apps, Yo
• ncdc/jboss-openshift-metrics-moduleA JBoss plugin that collects server performance metrics like memory usage on a schedule and publishes them for
• rogerluan/poo-puc-campinas-2016A collection of Java coursework and assignments from an Object-Oriented Programming class at PUC-Campinas univ
• asutosh936/job-finder-appA local Kanban job application tracker that uses the Claude API to generate cover letters, tailored resumes, i
• babisha-dev/core-java-programsA collection of Java example programs organized by topic for learners studying Java or preparing for technical
• clfurman/apcsa2026solutionsPersonal Java solutions to the 2026 AP Computer Science A free-response questions, with one runner or tester c
• omborse08/car-rental-system-java-lld-projectConsole Java practice project for a car rental system, persisting state in MySQL via JDBC with prepared statem
• asutosh936/spring-bootA tool that helps developers build and launch Java applications quickly with minimal setup by providing sensib
• clfurman/patternmatchingjava8A Java 8 code example showing how to simulate pattern matching using traditional object-oriented techniques be
• grygrflzr/versioncheckerA Java tool that Minecraft mod developers integrate into their mods to automatically notify players when a new
• isthaison/nsonA Java starter template for initializing new applications. The README is empty, so you'll need to explore the
• janikdotzel/cooking-buddyA sample Java app that builds an AI chatbot using OpenAI and the Akka framework, showing how to keep conversat
• janikdotzel/healthcare-agentAn AI chatbot that combines your fitness tracker data, medical records, and sensor readings into one conversat
• janikdotzel/liongard-mockLiongard Mock creates a local test server that mimics the real Liongard IT platform API, letting developers bu
• jianyuh/nlpA Java-based natural language processing project with no documentation. The README is completely empty, so the
• liushuyu/jdk8uOpenJDK 8 is the open-source version of Java's core development kit — the engine that lets computers compile a
• liushuyu/lab-8-template-wednesdayA starter template for a Java programming lab assignment. It provides pre-built project scaffolding so student
• slorello89/vidyo.io-connector-with-chat-androidA sample Android project in Java that shows developers how to add text chat alongside real-time video calls us
• thesashadev/discordpunishmentsA Minecraft server plugin that lets moderators ban, mute, or kick players through a Discord panel with buttons
• yaegor/teamcity-plugin-buildeventssampleA sample TeamCity plugin that logs every build completion event to a dedicated file, making it easy to track b
• yingfeng/pistachioPistachio is a fast, reliable storage system built for massive scale. It lets you run processing logic directl

All repos · Explain any other repo →