Autopsy® is a digital forensics platform and graphical interface
VisualVM is an All-in-One Java Troubleshooting Tool
Build great things at any scale
Database migrations made easy
A Distributed RESTful Search Engine
A Java library for technical analysis
An easy-to-use, high-performance distributed transaction solution
Advanced manager and monitor for Apache Tomcat
Magic Another Game Engine
A reference implementation of a JSON package in Java
Postgresql JDBC Driver
Automated driver management and helper features for Selenium WebDriver
Generate diagrams from textual description
Gephi the open graph Viz platform
Flexible, lightweight multi-language test reporting tool
Most popular Mocking framework for unit tests written in Java
Android logger, pretty, powerful and flexible, log to everywhere
Fast, scalable, multi-language and extensible build system
AnLinux allow you to run Linux on Android without root access
Fast, Flexible & Free Software to scale your Business
Java library that enables cross-platform access to popular native APIs
Pretty nice Zookeeper GUI, Support Win / Mac / Linux Platform
Test automation made simple
iText for Java represents the next level of SDKs for developers
H2 is an embeddable RDBMS written in Java