columbus is useful when you use your machine in different networks (it's great for laptop users). It uses ARP pings to look for known MAC-IP address correspondences, and can do this even when no IP address has been assigned yet. columbus can be hooked up to your network script. It can also be hooked up to your apmd and be told to re-check the network each time the computer wakes up. It also has a modified version of one of Donald Becker's link check tools to check your network when your network cable is plugged back in and if necessary, execute all synchronisation steps.
GStreamer is a streaming media framework that allows the construction of graphs of elements which operate on media data. Applications using this library can do anything from real-time sound processing over playing video to capturing audio, video, and even other types of media data. Its architecture allows for adding new data types or processing capabilities simply by installing new plug-ins. GStreamer is the core module, containing libraries, headers, the basic object hierarchy, and a set of media-agnostic core elements.
GStreamer Base Plug-ins is a well-groomed and well-maintained collection of GStreamer plug-ins and elements, spanning the range of possible types of elements one would want to write for GStreamer. It also contains helper libraries and base classes useful for writing elements. A wide range of video and audio decoders, encoders, and filters are included.
mach allows you to set up clean roots from scratch for any distribution or distribution variation supported. Currently, this is limited to RPM-based distributions. This clean build root can be used for making clean packages, running jailed services, testing builds, or making disk images of clean roots.