Open Source

JRuby - Java powered Ruby implementation [Scripting Languages]
JRuby is an 100% pure-Java implementation of the Ruby programming language.
Google XRuby - Ruby to Java bytecode compiler [Scripting Languages]
XRuby is the first Ruby to Java compiler which compiles Ruby source code (.rb) to Java bytecode (.class).
MG4J - Managing Gigabytes for [Search Engines]
MG4J (Managing Gigabytes for Java) is a free full-text search engine for large document collections written in Java. As a by-product, it offers several general-purpose optimised cl...
Zilverline Search Engine [Search Engines]
Zilverline is what you could call a 'Reverse Search Engine': Zilverline is a search engine that offers web access to your personal or intranet content. Zilverline is a 'Lucene D...
BDDBot - a web robot [Search Engines]
BDDBot is a web robot, search engine, and web server written entirely in Java(TM). It was written by Tim Macinta for his book (co-authored with Wes Sonnenreich), a Web Developer's ...
Egothor - a text search engine [Search Engines]
Egothor is an Open Source, high-performance, full-featured text search engine written entirely in Java. It is technology suitable for nearly any application that requires full-text...
Solr [Search Engines]
Solr is an open source enterprise search server based on the Lucene Java search library, with XML/HTTP and JSON APIs, hit highlighting, faceted search, caching, replication, and a ...
JSVN - A Java Subversion Client [Source Version Control Tools]
The goal of JSVN is to develop a Java Swing client to access and manipulate a Subversion repository. JSVN is currently under active development. JSVN is nearly "feature-complete" a...
SVNKit - a pure Java Subversion client library [Source Version Control Tools]
SVNKit is a pure Java Subversion client library. You would like to use SVNKit when you need to access or modify Subversion repository from your Java application, be it a standalone...
CBE - code building environment [Source Version Control Tools]
CBE is revision control system with integrated make-like functions written in pure Java. It can be used similar to CVS but offers some new features like renaming files (while still...