Your post and the title don't match.
(1) are there "Alternate apps for Stratus" and (2) "is there anything that comes close to ForeFlight?" are two completely different questions.
As to #1, sure. There are plenty of excellent apps out there with all the basic functionality of ForeFlight. The differences among all the iOS, Android, and now a few Windows apps are mostly interface - how is the information displayed and how to get around the app. That's a lot of personal preference stuff.
As to #2, well, if you have a Stratus there might be only one other choice. Stratus was designed and intended to work with ForeFlight exclusively. The folks at Seattle Avionics managed to get it to work with FlyQ, but only if the Stratus is still using the version 1.x firmware. If you have updated Stratus to version 2.x, it's ForeFlight only.