Original Post
For me the main problem in gd is always graphics. You spend almost a day to find reference, redraw, cut, pack and so on for a SINGLE sprite. When I worked in gamedev I saw how things done. In several words its a bunch of scripts. So I decide to make an easy to use pipeline that can do most of job.
pip install sprite-pipeline
sp_group folder_with_images --style style_image -W max_sprite_width -H max_sprite_height
AI can not suggest size for individual sprites so in this step you have to open output.psd, resize images, fix perspective, patch moments. Then you can do
sp_pack
And you get spritesheet and UVs for each group in PSD.
Tool is free and open source and have GPL3.0 license. Feel free to use. Suggest improvements, report bugs.