Site: https://firealpaca.com/
There are two versions of this program: FireAlpaca
FireAlpaca
FireAlpaca SE
Wikipedia: https://ja.wikipedia.org/wiki/FireAlpaca (japanese)
Platforms:
FireAlpaca: Windows, MacOS, Linux
FireAlpaca SE: Windows
Cost:
FireAlpaca: free
FireAlpaca SE: ~$40 on Steam
Ginchy - FireAlpaca Beginner Tutorial 2021/07/06
Bellasaurus - How I animate in Firealpaca 2021/05/24