WideStudio is an Integrated Development Environment (IDE) for building window applications in C++, Ruby, Python an Perl for Windows, MacOSX, Linux, FreeBSD, SOLARIS and other unix and BTRON and T-Engine. This is open and free (under MIT/X Consortiun Lice
Tool to parse the command line and configuration files.
Powerful command line and configuration file parsing for C++, Python, Ruby and Java (others to come). This tool provides many features, such as separate treatment for options, variables, and flags, unrecognized object detection, prefixes and much more.
CloudI is an open-source private cloud computing framework for efficient, scalable, and stable soft-realtime event processing.
Joint - An abstract interface to Java. Joint is an interface to JNI that provides access to objects in an object oriented fashion, allowing applications to forget about the details of JNI. First up - a powerful interface from Ruby to Java!
A FOSS operating system that aims to meet NSA's TPEP TCB A1 evaluation standard while retaining application compatibility at minimal performance overhead.
Miso Python Library is a Python for S60 extension providing simple utility functions and classes, implemented on top of Symbian OS native resources. (The latest source code is hosted on GitHub, not on SourceForge.)
Ruby Inline's 13+ releases has been fully migrated to http://rubyforge.org/projects/rubyinline/ Please go there for more information. It just seems to work better over there. :/ (just click home page above)
Waterford procedurally simulates, and visualizes, demographic development.
COTSon scalable simulation infrastructure
Curupira is a powerful, full-featured, cross-platform, pretty-well-tested, well-documented and easy-to-use open source server application (shard emulator) for ultima online.
A template library for easy and intuitive binding of C++ objects to Ruby, similar to luabind.