libmng-py is a Python wrapper around the libmng C library. It currently supports the most important parts of the library, and supports displaying and usage with the most popular toolkits (such as pygame and wxPython). It runs on Mac OS X, Linux, and Windows on all architectures on which ctypes also runs.
m3ute2 is a CLI program designed for easily moving subsets of large media collections from one location to another while providing information to the user about what it is doing. It can take file data from both lists (text files such as M3U playlists and plain lists) and directories, with powerful filtering options for both.
MultiVideo is an image sequence viewer that is targeted to researchers in the image processing field. It features the ability to display several sequences simultaneously in multiple synchronized views, supports many sequence formats, (including formats without compression that are very useful for researchers), displays very long image sequences without loading them in memory, and runs on multiple platforms thanks to the wxWindows library.
CastCluster provides access to additional content on iTunes, Apple TV, iPod, or a random podcast viewer. It currently supports YouTube, Google Video, Revver, local disks, and RSS feeds as sources of content. It uses ffmpeg for video conversion. It also provides some other bookmarklet functionality, like digg and del.icio.us.