Very useful website for converting project files to be used in other programs.
Ex. ust -> ccs

This website is useful for making AI isolated instrumentals for songs that do not have an instrumental publicly available

*After 60 days you are required to buy a license but you can still use it without limitations even if you don't. So its kinda free forever.

Free, opensource audio editor.

*It works but its not great.

In-browser DAW