GitHub

GifToFrames is a Python application that allows you to convert GIF files into individual frames and create sprite sheets from those frames. You can also export the frames as ...

Open: Click the "Open" option in the File menu to select a GIF file from your computer. The GIF file will be loaded, and its frames will be displayed as thumbnails on the interface. Export: After ...
GIGAZINE

'Online GIF Tools' that allows you to edit many things such as changing the playback speed of GIF animation, mosaic processing, transparency processing, etc.

'Online GIF Tools ' is an online tool that allows you to cut out animated GIFs with a series of motions in a continuous image file and change the brightness. I actually tried using this GIF editing ...
GitHub

A sprite library, complete with frame-rate throttling, that can be used to replace animated GIFs with PNG sprite sheets.

Sprite sheets can have any number of items per row, but 1 row = 1 second By default we assume a row has 30 frames of animation, so if not, make sure to pass in fps as an option, new Sprite(htmlImg, ...