On: Evolution of <img>: Gif without the GIF

[nasredin]

They are not really "custom".

Maximum quality is usually via

Video editor:

VirtualDub

MKVToolNix

(cut a scene and convert to uncompressed video)

GIF editor (they are still around):

Jasc Animation Shop

Ulead Gif Animator

(open uncompressed video and convert to GIF)

And there are a ton of noob-friendly tools that combine the two.