Modify Frame Rate in Aseprite
Speed up or slow down animation
AseScale
Automates export of Aseprite files in different scales and formats.
Godot Video Converter
Video converter + sprite atlas generator for Godot and Love2D
anyGIF
A UI-based program to convert any video file to a GIF using ffmpeg.
Kindgifs
A tool for making cute gifs to say kind things to people