I have a Canon T2i (2010) I am looking to upgrade. Are there any other brands of camera that my Canon lenses will fit?
The Canon Rebel T2i uses Canon lenses with an EF lens mount.
You can mount these lenses to a variety of other cameras using an adapter. Here are some examples:
Typically you will only see adapters to mount a lens on an equal or lower end camera (not many people will mount a cheap lens on a Hasselblad for example).
No SLRs (Canon has a shorter mount registration distance, a complete deal-breaker)(O.K., maybe 4/3s would work.), but yeah, there are adapters for various mirrorless systems.
But you're usually better off using a lens designed for the system you're using it on. Things like autofocus are likely be absent or impaired on foreign systems.
There are a bunch of good reasons for living with the drawbacks of mixed systems. But if you can't articulate one, don't.