MongoDB is a high-performance, open source, schema-free document-oriented data store that's easy to deploy, manage and use. It's network accessible, written in C++ and offers the following features :

• Full index support, including on inner objects...

xu‧ggle (zŭ' gl) v. To freely encode, decode, and experience audio and video.

With Xuggle you can write Java programs that decode or encode video.

It incorporates FFMPEG, but adds a simpler interface that is safe to use from Java-like languages (e.g. garbage collection) and tries hard to make sure usage of FFMPEG features doesn't crash a JVM....

rxvt-unicode is a modern, Unicode-aware color xterm replacement that uses significantly less memory than a conventional xterm and many other Unicode supporting terminal emulators.

It supports using multiple fonts at the same time, including Xft fonts, and client-server technology to reduce memory consumption when using multiple windows....

matplotlib is a python 2D plotting library which produces publication quality figures in a variety of hardcopy formats and interactive environments across platforms. matplotlib can be used in python scripts, the python and ipython shells (similar to matlab or mathematica), web application servers, and six graphical user interface toolkits....

GNU Aspell is a spell checker designed to eventually replace Ispell. It can either be used as a library or as an independent spell checker. Its main feature is that it does a superior job of suggesting possible replacements for a misspelled word.

Filesystem in Userspace is a simple interface for userspace programs to export a virtual filesystem to the Linux kernel. It also aims to provide a secure method for non privileged users to create and mount their own filesystem implementations.

gThumb is an image viewer written for the GNOME environment. It lets you browse your hard disk, showing you thumbnails of image files. It also lets you view single files (including GIF animations), organize images in catalogs, print images, view slideshows, set your desktop background, and more. gThumb also supports Nautilus thumbnails....

Psi is a leading instant messaging / real-time communications client for the Jabber network (using the XMPP protocol). It is cross platform, available for Windows, Mac OS X and X11 (Linux, BSD, Solaris etc.) platforms. It uses the Qt library.

It aims to be (and is famous for being) standards compliant and stable. It is also at the cutting edge of XMPP development, with several of the authors very actively involved in the XMPP standards extension process....

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....

LibreOffice is an integrated office suite based on copyleft licenses and compatible with most document formats and standards. Libreoffice is backed by The Document Foundation, which represents a large independent community of enterprises, developers and other volunteers moved by the common goal of bringing to the market the best software for personal productivity. LibreOffice is open source, and free to download, use and distribute....