BareBones has had several good programs to go along with BBEdit.
Yojimbo is a kind of catch-all database where you can cram stuff and organize it. Kind of like a Pinterest for all kinds of things, not just images. With the family pack, everybody can have access to the same lump-o-stuff.
Way back in the day, they had Mailsmith, which was, more or less, a POP mail client with BBEdit crammed in. (This was back when pretty much all email was text and not HTML.) If you used email a lot, and needed to do clever things with it, it was fantastic. It never made the jump to IMAP AFAIK, so it kind of died out. I really liked it, but in today's world where a lot of email doesn't come multipart MIME, just HTML, it would be less useful.
But BBEdit is just great. Much like emacs, once you get immersed into the ecosystem, you find leaving it difficult. You end up with a collection of snippets and widgets and scripts and bits and bobs that become your workflow. And you can script all of it as well. It continues to chug along with ridiculously large files, even back when you might work on files bigger than the amount of RAM in your machine.
I'll remain a Mac user for as long as BBEdit works on it. While I can use other editors, if I have the choice I'll work in BBEdit.