Thanks for your list! I'll checkout a few to prep for the jam. These are a few I like
Music:
Bosca Ceoil is a pretty good music software for really easily throwing SOMETHING together in time, sound design is my weakest aspect by far but this program usually helps.
Engines:
I've HEARD a lot of good things about Godot, I haven't used it myself but may switch over from unity. Game maker studio 2 is amazing for 2D games, you would have to buy the full version for the jam as you can really upload without it (from my knowledge).