GIMP is the GNU Image Manipulation Program. It is a freely distributed piece of software suitable for such tasks as photo retouching, image composition and image authoring. It can be used as a simple paint program, an expert quality photo retouching program, an online batch processing system, a mass production image renderer, a image format converter, etc.
Kid3 tagger can edit the ID3v1 tags and all ID3v2 frames in MP3 files and the tags in Ogg/Vorbis and FLAC files in an efficient way. It is easy to convert between ID3v1 and ID3v2, set the tags of multiple files to the same values and generate the tags from the file name or vice versa. Import is possible from freedb.org, MusicBrainz, and other sources of track data.
Asymptote is a powerful descriptive 2D and 3D vector graphics language for technical drawing, inspired by MetaPost but with an improved C++-like syntax. It provides for figures the same high-quality level of typesetting that LaTeX does for scientific text. Asymptote is a programming language as opposed to just a graphics program. It can exploit the best features of script (command-driven) and graphical user interface (GUI) methods. High-level graphics commands are implemented in the language itself, allowing them to be easily tailored to specific applications.
AgileGallery is a photo gallery that processes the XML output from Picasa, generates paging and thumbnails, and displays the full sized photos along with any captions entered in Picasa. AgileGallery presently comes in two flavors: one that uses AJAX for the interface and one that uses Flash. AgileGallery does not require any server-side technology to generate photo galleries.
Shader Maker is a simple, cross-platform GLSL editor. It provides the basics of a shader editor, such that students can get started with writing their own shaders as quickly as possible. This includes syntax highlighting in the GLSL editors, a geometry shader editor (as well as vertex and fragment shader editors, of course), interactive editing of the uniform variables, light source parameters, pre-defined simple shapes and a simple OBJ loader, and a few more.