Jodd! Lightweight. Java. Zero dependencies. Use what you like.

Rest.li is a REST+JSON framework for building robust, scalable service architectures using dynamic discovery and simple asynchronous APIs.

Resilience4j is a fault tolerance library designed for Java8 and functional programming

Governator is a library of extensions and utilities that enhance Google Guice to provide: classpath scanning and automatic binding, lifecycle management, configuration to field mapping, field valid…

A static analyzer for Java, C, C++, and Objective-C

Open source alternative to Auth0 / Firebase Auth / AWS Cognito