FreeMind is Mind-Mapping tool and an intuitive editor for tree-structured data. It features a modular design, and can be used to edit any kind of data, dependent on the current mode. The data is represented as a Mind-Map, while data, behavior, node style, edge style, color, etc. are determined by the mode. It features one-click fold, unfold, and "follow link" operations....

Apache Lucene is an information retrieval API originally implemented in Java. It is a technology suitable for nearly any application that requires full-text search, especially cross-platform. Lucene has been ported to other programming languages including Perl, C#, C++, Python, Ruby and PHP....

Jenkins is a continuous integration server, allowing you to automatically monitor source repositories, build software and run tests.

One-click installation and out-of-the-box cluster support make it easy to get started improving your software, or just giving you greater control of your daily task automation....

LLVM is a robust system, particularly well suited for developing new mid-level language-independent analyses and optimizations of all sorts, including those that require extensive interprocedural analysis. LLVM is also a great target for front-end development for conventional or research programming languages, including those which require compile-time, link-time, or run-time optimization for effective implementation, proper tail calls or garbage collection. We have an incomplete list of projects which have used LLVM for various purposes, showing that you can get up-and-running quickly with LLVM, giving time to do interesting things, even if you only have a semester in a University course. We also have a list of ideas for projects in LLVM....

Provides extra functionality for classes in java.lang.

Lang provides a host of helper utilities for the java.lang API, notably String manipulation methods, basic numerical methods, object reflection, concurrency, creation and serialization and System properties. Additionally it contains basic enhancements to java.util.Date and a series of utilities dedicated to help with building methods, such as hashCode, toString and equals....

Doxygen is a documentation system for C++, C, Java, Objective-C, Python, IDL (Corba and Microsoft flavors), Fortran, VHDL, PHP, C#, and to some extent D.

Doxygen is developed under Linux and Mac OS X, but is set-up to be highly portable. As a result, it runs on most other Unix flavors as well. Furthermore, executables for Windows are available....

Commons IO is a library of utilities to assist with developing IO functionality.

There are four main areas included:

• Utility classes - with static methods to perform common tasks
• Filters - various implementations of file filters
• Comparators - various implementations of java.util.Comparator for files...

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 web administration interface. It typically runs in a Java servlet container such as Tomcat....

jEdit is an Open Source text editor written in Java. It has many useful features, such as syntax highlighting, bracket matching, regular expression searching, multiple file search and replace, folding, and keyboard macros. jEdit also includes a powerful plugin architecture that allows more than 80 plugins to be downloaded and installed from within the editor....

Apache Axis is an implementation of the SOAP ("Simple Object Access Protocol") submission to W3C.