GraphicsMagick provides a set of commandline tools and programming APIs for manipulating, editing, and converting raster and vector images. It is derived from ImageMagick, with the objective of providing better stability and performance than ImageMagick while retaining the original MIT/X11 license.
With openAviToGif you can convert video into an animated gif file.
What's new in v0.6:
-GPU processing
-improvements and bugfixes
Use your video card to speed up the conversion. Recommended for those who have high-end video cards.