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Good First Issue curates easy pickings from popular open-source projects, and helps you make your first contribution to open-source.

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Distributed Workflow Engine for Microservices Orchestration
lang: Java
stars: 2.4K
last activity: 9 minutes ago
APM, Application Performance Monitoring System
lang: Java
stars: 19.71K
last activity: a day ago
Open source routing engine for OpenStreetMap. Use it as Java library or standalone web server.
lang: Java
stars: 3.7K
last activity: 2 days ago
An Android library for managing images and the memory they use.
lang: Java
stars: 16.81K
last activity: 16 hours ago
A DLNA, UPnP and HTTP(S) Media Server.
lang: Java
stars: 1.73K
last activity: 5 hours ago
Cruise-control is the first of its kind to fully automate the dynamic workload rebalance and self-healing of a Kafka cluster. It provides great value to Kafka users by simplifying the operation of Kafka clusters.
lang: Java
stars: 2.21K
last activity: 6 days ago
AssertJ is a library providing easy to use rich typed assertions
lang: Java
stars: 2.18K
last activity: a day ago
OpenGrok is a fast and usable source code search and cross reference engine, written in Java
lang: Java
stars: 3.61K
last activity: 22 minutes ago
Ecosystem to transform any database into a distributed database system, and enhance it with sharding, elastic scaling, encryption features & more
lang: Java
stars: 16.23K
last activity: 16 minutes ago
Quarkus: Supersonic Subatomic Java.
lang: Java
stars: 10.34K
last activity: 12 minutes ago
Build cross-platform Native Progressive Web Apps for iOS, Android, and the Web ⚡️
lang: Java
stars: 7.65K
last activity: 14 hours ago
seata / seata
🔥 Seata is an easy-to-use, high-performance, open source distributed transaction solution.
lang: Java
stars: 22.41K
last activity: 13 minutes ago
Apache Dubbo is a high-performance, java based, open source RPC framework.
lang: Java
stars: 37.54K
last activity: an hour ago
alibaba / nacos
an easy-to-use dynamic service discovery, configuration and service management platform for building cloud native applications.
lang: Java
stars: 23.05K
last activity: 2 hours ago
Eclipse Collections is a collections framework for Java with optimized data structures and a rich, functional and fluent API.
lang: Java
stars: 2.01K
last activity: 17 hours ago
A powerful flow control component enabling reliability, resilience and monitoring for microservices. (面向云原生微服务的高可用流控防护组件)
lang: Java
stars: 19.42K
last activity: 4 days ago
Free and Open, Distributed, RESTful Search Engine
lang: Java
stars: 60.26K
last activity: 20 minutes ago
crate / crate
CrateDB is a distributed SQL database that makes it simple to store and analyze massive amounts of machine data in real-time.
lang: Java
stars: 3.44K
last activity: 9 minutes ago
📲cim(cross IM) 适用于开发者的分布式即时通讯系统
lang: Java
stars: 8.44K
last activity: 19 days ago
The SpotBugs plugin for security audits of Java web applications and Android applications. (Also work with Kotlin, Groovy and Scala projects)
lang: Java
stars: 1.9K
last activity: a month ago
A libre lightweight streaming front-end for Android.
lang: Java
stars: 19.66K
last activity: 11 hours ago
OWASP VulnerableApp Project: For Security Enthusiasts by Security Enthusiasts.
lang: Java
stars: 119
last activity: 6 days ago
JabRef / jabref
Graphical Java application for managing BibTeX and biblatex (.bib) databases
lang: Java
stars: 2.65K
last activity: 7 hours ago
📱 Nextcloud Android app
lang: Java
stars: 2.95K
last activity: 21 minutes ago
An open source SQL database designed to process time series data, faster
lang: Java
stars: 8.84K
last activity: 15 minutes ago
🏗 Build container images for your Java applications.
lang: Java
stars: 11.92K
last activity: a day ago
Your go-to microservice framework for any situation, from the creator of Netty et al. You can build any type of microservice leveraging your favorite technologies, including gRPC, Thrift, Kotlin, Retrofit, Reactive Streams, Spring Boot and Dropwizard.
lang: Java
stars: 3.7K
last activity: 2 hours ago
Open-source distributed computation and storage platform
lang: Java
stars: 4.92K
last activity: 6 hours ago
Kafka GUI for Apache Kafka to manage topics, topics data, consumers group, schema registry, connect and more...
lang: Java
stars: 2.54K
last activity: 3 days ago
Cross-platform framework for building truly native mobile apps with Java or Kotlin. Write Once Run Anywhere support for iOS, Android, Desktop & Web.
lang: Java
stars: 1.26K
last activity: 12 days ago
Strongbox is an artifact repository manager.
lang: Java
stars: 489
last activity: 8 months ago
Allure Report is a flexible, lightweight multi-language test reporting tool. It provides clear graphical reports and allows everyone involved in the development process to extract the maximum of information from the everyday testing process
lang: Java
stars: 2.86K
last activity: 5 days ago
The OWASP ZAP core project
lang: Java
stars: 9.65K
last activity: 24 minutes ago
🔎 Open source distributed and RESTful search engine.
lang: Java
stars: 5.33K
last activity: 39 minutes ago
pmd / pmd
An extensible multilanguage static code analyzer.
lang: Java
stars: 3.9K
last activity: 5 days ago
ccrama / Slide
Slide is an open-source, ad-free Reddit browser for Android.
lang: Java
stars: 1.7K
last activity: 7 days ago
SpotBugs is FindBugs' successor. A tool for static analysis to look for bugs in Java code.
lang: Java
stars: 2.76K
last activity: 5 days ago
Sable / soot
Soot - A Java optimization framework
lang: Java
stars: 2.27K
last activity: 5 days ago
SVG library for React Native, React Native Web, and plain React web projects.
lang: Java
stars: 6.11K
last activity: 6 hours ago
The Data Transfer Project makes it easy for people to transfer their data between online service providers. We are establishing a common framework, including data models and protocols, to enable direct transfer of data both into and out of participating online service providers.
lang: Java
stars: 3.36K
last activity: 21 hours ago
Collection of Quines in all programming languages
lang: Java
stars: 1
last activity: 4 months ago
Social share, sending simple data to other apps.
lang: Java
stars: 3.08K
last activity: 5 days ago
Eclipse OpenJ9: A Java Virtual Machine for OpenJDK that's optimized for small footprint, fast start-up, and high throughput. Builds on Eclipse OMR (https://github.com/eclipse/omr) and combines with the Extensions for OpenJDK for OpenJ9 repo.
lang: Java
stars: 2.89K
last activity: 6 hours ago
React Native Contacts
lang: Java
stars: 1.5K
last activity: 11 days ago
Astra: a Java tool for analysing and refactoring Java source code
lang: Java
stars: 42
last activity: a day ago
A decentralized bitcoin exchange network
lang: Java
stars: 4.03K
last activity: a day ago
a fast, scalable, multi-language and extensible build system
lang: Java
stars: 18.93K
last activity: an hour ago
A classic inspired shoot em' up game written in Java with JavaFX and FXGL.
lang: Java
stars: 6
last activity: 10 hours ago
The open big data serving engine. https://vespa.ai
lang: Java
stars: 3.98K
last activity: 21 minutes ago
A podcast manager for Android
lang: Java
stars: 4.31K
last activity: 3 days ago
Free and open source log management
lang: Java
stars: 6.17K
last activity: 14 minutes ago
Terasology - open source voxel world
lang: Java
stars: 3.36K
last activity: 14 hours ago
Java Bindings for V8
lang: Java
stars: 2.23K
last activity: 8 months ago
Testcontainers is a Java library that supports JUnit tests, providing lightweight, throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container.
lang: Java
stars: 6.1K
last activity: 12 hours ago
Free universal database tool and SQL client
lang: Java
stars: 27.24K
last activity: 12 minutes ago
OpenRefine is a free, open source power tool for working with messy data and improving it
lang: Java
stars: 8.89K
last activity: 38 minutes ago