DeuTex is a wad composer for Doom, Heretic, Hexen and Strife. It can be used to extract the lumps of a wad and save them as individual files. Conversely, it can also build a wad from separate files. When extracting a lump to a file, it does not just copy the raw data, it converts it to an appropriate format (such as PPM for graphics, .au for samples, etc.). When it reads files for inclusion in pwads, it does the necessary reciprocal conversions. In addition, DeuTex has functions such as merging wads, etc.
Drip is a DVD to divx conversion tool. The application is GNOME based, but the encoding part of it is available as a textmode tool. Using the GUI just makes it all easier, and adds some logic, like automatic filenaming and subpicture detection. Drip does the whole job in 1 go; no user interaction is needed during runtime.
Scilla answers media file requests and takes conversion parameters for various media converters. Manipulated media files can be cached for future requests. Scilla is designed to take requests using the servlet API. A HttpServlet is included, and it maps path-info to a file and passes request parameters to converters.
im2avi is a small program for making AVIs from sequences of images. It makes use of avifile for encoding video streams, so im2avi has access to all the codecs that avifile supports, including DivX ;) or Cinepak. It uses the ImageMagick++ library to load the images, so it supports a wide range of formats.
Camsource is a modularized and multithreaded daemon for grabbing image frames from a video4linux device. It uses a simple yet powerful plugin system, which allows it to use the same grabbed images for multiple purposes at the same time. It features image filter plugins, which can be daisychained in the XML config file to modify the image before passing them to other plugins. Included plugins provide compatibility with camserv (multipart jpeg streams) and webcam_server, a local snapshot file writing module, and an FTP upload module, as well as basic image filtering (resizing, flipping, and rotating).