• open source
  • GIMP can easily create GIFs from many individual frames
• free
  • Beneton Movie GIF (infected with the OneStep Search Tool though)
• payware, but easily cracked
  • GIFMation (crack found for v2.5, 2009-01-13, at keygen.ms) (installs under C:\Program Files\BoxTop Software\)
  • GIF Movie Gear (crack found for 4.0.2, 2009-01-24, at keygen.ms) (installs under C:\Program Files\Visicom Media\) (INSTALLS TWO THINGS THAT HAVE TO BE UNINSTALLED: "vmn toolbar", "CA VMN Anti-Spyware")

those that do optimization

• ImageMagick
• GIF Movie Gear