ZXing (pronounced "zebra crossing") is an open-source, multi-format 1D/2D barcode reader library implemented in Java.

Import, organize, play, and share your music using Banshee's simple, powerful interface.

Rip CDs, play and sync your iPod, create playlists, and burn audio and MP3 CDs. Most portable music devices are supported.

Banshee also has support for podcasting, smart playlists, music recommendations, and much more....

Ogg Vorbis is a fully open, non-proprietary, patent-and-royalty-free, general-purpose compressed audio format for mid to high quality (8kHz-48.0kHz, 16+ bit, polyphonic) audio and music at fixed and variable bitrates from 16 to 128 kbps/channel. This places Vorbis in the same competitive class as audio representations such as MPEG-4 (AAC), and similar to, but higher performance than MP3 and WMA....

Haskell is an advanced purely functional programming language. The product of more than twenty years of cutting edge research, it allows rapid development of robust, concise, correct software. With strong support for integration with other languages, built-in concurrency, debuggers, profilers, rich libraries and an active community, Haskell makes it easier to produce flexible, maintainable high-quality software....

Apache Jackrabbit is a fully conforming implementation of the Content Repository for Java Technology API (JCR). A content repository is a hierarchical content store with support for structured and unstructured content, full text search, versioning, transactions, observation, and more....

Google App Engine enables developers to build python web applications on the same scalable systems that power Google's applications.

Google App Engine exposes a fully-integrated development environment.

Google App Engine makes it easy to design scalable applications that grow from one to millions of users without infrastructure headaches. ...

JBoss Application Server is the #1 most widely used Java application server on the market. Hundreds of professional open source developers have contributed to the JBoss Application Server over the years and community contributors are not only welcome but encouraged. In fact all JBoss employed contributors to the JBoss Application Server were hired from the community and each of them contributed to an open source project in one way or another....

Sinatra a DSL for quickly creating web-applications in Ruby with minimal effort.,

The program stores your passwords in a highly encrypted database. This database consists of only one file, so it can be easily transferred from one computer to another.

MapServer is an Open Source platform for publishing spatial data and interactive mapping applications to the web.