emote_creator.blend and emote_creator_bend.blend are project for Blender
bend can create emotes containing bending, but it's a bit more complicated to use.
To use these, use the 2.83 LTS, or the latest version of Blender.
Emotecraft wiki if you're stuck.
model.bbmodel is a model for Blockbench You can use this as well.
To use it, you'll need to install GeckoLib plugin first.
You can create your own program or edit the file by hand
The emote format documentation is here