ansi2gif lets you re-live your old BBS ANSI creating days. Any files with text and ANSI-compliant escape codes can be turned into a GIF, PNG, or EPS. This includes animations and files with blinking attributes which are turned into animated GIFs. You can time the speed of the animation.
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.
hp2xx is a versatile tool to convert vector-oriented graphics data given in Hewlett-Packard's HP-GL (a.k.a. HPGL) plotter language into a variety of popular both vector- and raster-oriented graphics formats. The various supported output formats include Encapsulated PostScript (EPS), PCX, IMG, and several formats intended to facilitate the generation of graphics within TeX documents. In addition, hp2xx output is printable on the HP Laserjet/Deskjet printer series, and it may be used as a HP-GL previewer on many platforms, e.g. X11 and DOS (VGA).
icontact is a highly-configurable Perl script that takes a bunch of image files and creates contact sheets. icontact determines the file format by the file name extension of the input files, and then uses internal tables to look up the commands it needs to execute in order to convert the images to the PPM format. Once they're converted, icontact uses various pbmplus commands to create contact sheets. icontact is particularly useful if you have lots of image files in all sorts of different formats and you want to create an index of all of them without converting them all to a common format first. This package also includes a filter to convert xv's .xvpics files into PPM format.
The icoutils are a set of programs for extracting and converting images in Microsoft Windows icon and cursor files. These files usually have the extension .ico or .cur, but they can also be embedded in executables and libraries (.dll-files). Icoutils can also create icon and cursor files.
Ilib is an image manipulation library for developers. It's capable of reading and writing images (PPM/PGM, PNG, JPEG, GIF, XPM, BMP) and many drawing functions including drawing lines and text using any BDF (X11) font. It's great for generating GIFs/PNGs from a CGI or generating graphs. Ilib includes sample applications for generating graphs for HTTP access.log files and QuakeWorld server frag log files and a tool for creating image indices from a group of images.
Noptec Vector is an implementation of a bitmap vectorizing algorithm, specifically for creating background picture resources for the Sierra AGI interpreter. The program reads an image in BMP, PCX, or TGA format, converts it to 160 x 168 x 16 colors and writes the result in AGI readable format, optionally showing the result onscreen.