Looking for suggestions on a free EQ tuning software compatible with Linux

The title pretty much covers the bulk of what I’m asking but I do have 1 more follow up question.

I’ve done a few internet searches and have found some results but I want to see what others use and would ultimately recommend instead of just picking one and hoping for the best.

Would this software work with a general external microphone or is there a different type of microphone that needs to be purchased?

Additionally, I have 1 follow up question which is would something like a calibration microphone that receivers use work with the software at all?

Many thanks in advance.