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Netty project - an event-driven asynchronous network application framework
Apache Kafka - A distributed event streaming platform
JDK main-line development https://openjdk.org/projects/jdk
Most popular Mocking framework for unit tests written in Java
Apache Pulsar - distributed pub-sub messaging system
Tink is a multi-language, cross-platform, open source library that provides cryptographic APIs that are secure, easy to use correctly, and hard(er) to misuse.
Very spicy additions to the Java programming language.
Guice (pronounced 'juice') is a lightweight dependency injection framework for Java 11 and above, brought to you by Google.
A simple expressive web framework for java. Spark has a kotlin DSL https://github.com/perwendel/spark-kotlin
✅ The programmer-friendly testing framework for Java and the JVM
configuration library for JVM languages using HOCON files
The official AWS SDK for Java 1.x (In Maintenance Mode, End-of-Life on 12/31/2025). The AWS SDK for Java 2.x is available here: https://github.com/aws/aws-sdk-java-v2/
Fluent testing assertions for Java and the JVM
Discord4J is a fast, powerful, unopinionated, reactive library to enable quick and easy development of Discord bots for Java, Kotlin, and other JVM languages using the official Discord Bot API.
Collection of JUnit example projects
Slack Developer Kit (including Bolt for Java) for any JVM language
Advanced Java library for integration testing, mocking, faking, and code coverage
High throughput asynchronous task processing on Apache Kafka
Leading SIP - IMS - WebRTC Application Server