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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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Projects in Java (all languages)
OpenGrok is a fast and usable source code search and cross reference engine, written in Java
lang: java
stars: 3.04K
last activity: Sep 18, 2020
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: 2.81K
last activity: Sep 18, 2020
lang: java
stars: 2
last activity: Jun 10, 2020
line / armeria
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: 2.73K
last activity: Sep 18, 2020
The SpotBugs plugin for security audits of Java web applications and Android applications. (Also work with Kotlin, Groovy and Scala projects)
lang: java
stars: 1.46K
last activity: Sep 16, 2020
Allure Framework is a flexible lightweight multi-language test reporting tool. It provides clear graphical reports and allows everyone involved in the development process extract maximum of information from everyday testing process.
lang: java
stars: 1.94K
last activity: Sep 17, 2020
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: 2.98K
last activity: Sep 17, 2020
seata / seata
🔥 Seata is an easy-to-use, high-performance, open source distributed transaction solution.
lang: java
stars: 17.25K
last activity: Sep 18, 2020
Material design file manager for Android
lang: java
stars: 3K
last activity: Sep 18, 2020