Alternative to Screenconnect (and Mesh Central)

[CCWTech]

We currently use Mesh Central as our primary software for remoting into machines.
We currently use ScreenConnect as a backup solution (when Mesh has problems, etc.)

However, ScreenConnect requires a Windows server (it technically works on Linux, but is not supported and for many reasons has poor performance).

I'm looking for suggestions for an alternate to Screenconnect that isn't Mesh Central. We have about 10 users and 2500 machines. I would like to host myself on something like VULTR.

SELF HOSTED, LOW COST or FREE is a HUGE plus.