There's way more than that...
- Marvel published a Romulan/ Borg comic entitled 'Operation: Assimilation.'
- Wildstorm published a comic anthology 'Star Trek Special' which contained a few stories not based on the main characters.
- IDW has 6 or 7 issues which star TOS Romulans.
- They also published several Alien Spotlight, Crew, and Captain's Log comics which either star all new characters or at least secondary characters.
- There's also IDWs Assignment: Earth miniseries starring Gary Seven.
- There are several issues of Malibu and DC comics which I think are basically spin offs which don't star the main characters much if at all, but I couldn't tell you offhand which ones.