GIF

• MergeGIF -- My improved alternative to the GIFMerge program.
  This program likes the input GIFs to have identical color tables (although it's not required, but then you will get local color tables), so use the ppmtogif program first.
  Executable for DOS: mergegif.exe
• SplitGIF -- To split Animated GIF into separate images.
  Executable for DOS: splitgif.exe
• gifread.c -- A Tool for Analysing GIFs, recognizes all 89a stuff and the NETSCAPE2.0 Extension.
  Executable for DOS: gifread.exe
• gifstrip.c -- A utility that reduces the size of a GIF by:
  • removing comments,
  • removing local color tables that are identical to the global color table.
  You can use the ppmtogif program (part of the Unix libgr-progs package) to create a set of GIF's with identical color tables. Merging them with GIFMerge creates an animated GIF with identical color maps in one GIF. In this case, use gifstrip.
  Executable for DOS: gifstrip.exe

Manuals

• GIF89a -- Programming Reference, also available in ascii
• NETSCAPE2.0 Extension -- Looping Animated GIF