MusicBrainz Picard is a cross-platform (Linux/Mac OS X/Windows) application written in Python and is the official MusicBrainz tagger.

Picard supports the majority of audio file formats, is capable of using audio fingerprints (PUIDs), performing CD lookups and disc ID submissions, and it has excellent Unicode support. Additionally, there are several plugins available that extend Picard's features....

Apache Zeta Components are a high quality, general purpose library of loosely coupled components for the development of applications based on PHP5. Beside typical modules for web application development like a template engine, database tools and an MVC component, Apache Zeta Components contain command line tools, a chart rendering library, a WebDAV server, a universal document conversion component and more tools to ease developers' lives....

ASDF is Another System Definition Facility,

SimpleTest is a unit tester, Web tester, and dynamic mock objects framework for PHP. The test structure is similar to JUnit/PHPUnit. Used as a Web tester, you can navigate sites and submit forms as if you were using a Web browser.

PyPI is the Python Package Index at http://pypi.python.org/,

OpenEmbedded is a tool which allows developers to create a fully usable Linux base for various embedded systems. It has been designed to be able to handle different hardware architectures, support multiple releases for those architectures, and utilize tools for speeding up the process of recreating the base after changes have been made....

Drools Expert is a fast, scalable, lightweight rule engine in Java.
Drools Fusion adds complex event processing (CEP).
Workbench is the web application and repository to govern Drools assets.

GConf is a system for storing application preferences. It is intended for user preferences; not configuration of something like Apache, or arbitrary data storage.

Apache Camel is a powerful rule based integration framework which provides a POJO based implementation of the Enterprise Integration Patterns using an extremely powerful fluent API (or declarative Java Domain Specific Language) to configure routing and mediation rules. The Domain Specific Language means that Apache Camel can support type-safe smart completion of routing rules in your IDE using regular Java code without huge amounts of XML configuration files; though Xml Configuration inside Spring is also supported....

SciTE is a SCIntilla based Text Editor. Originally built to demonstrate Scintilla, it has grown to be a generally useful editor with facilities for building and running programs. It is best used for jobs with simple configurations - I use it for building test and demonstration programs as well as SciTE and Scintilla, themselves....