FOVE's public software release has supported Windows 8.1 and later from the beginning.
Linux is supported as of October 2020 (v1.0). It requires Ubuntu 20.04 & NVIDIA binary drivers.
Please see our detailed article on how to get started here:
Getting Started With FOVE on Linux
We do not yet support intercompatiblity between versions. For example, a Linux application built against SDK v1.1 will only run against the v1.1 runtime. We plan to stabilize this in the future.
We do have Mac builds internally, but the lack of direct mode support prevents it from running with low latency. To our knowledge, Apple has not publicly exposed any interface for a direct mode.
If you are ok with running in extended mode (and the various troubles that come with that), we may be able to provide a Mac build specially for you, but using Windows or Linux will likely be a better option.