I use Cursor and Aider, I hadn't heard of Double. I've tried a bunch of others including Continue.dev, but found them all to be lacking.

can you please elaborate on how you use Cursor and Aider together?

I don't really use them together exactly, I just alternate backwards and forwards depending on the type of task I'm doing. If it's the kind of change that's likely to be across lots of files (writing) then I'll use Aider. If it only uses context from other files I'll likely use Cursor.