Other usage of бы is often phraseological.

1)There are combinations of "где бы ни", "кто бы ни", "что бы ни" etc., which means "wherever", "whoever", "whatever"...

2)"хотя бы" = "at least"

3)"Как будто" = "как будто бы" = "будто бы" = (colloquial)"как бы" = "as if"

...

There are more phrases I think.