Are there open source exchange servers?

Question

open source

It would be interesting to read about the device of the server exchange software, and / or watch it live.

Answer 1

no
exchanges can be counted on one hand
there is no reason for the birth of open source in this niche

Answer 2

I suspect that there are crap simulators like this
habrahabr.ru/post/129489
Oh, I also saw metatraider5
www.metatrader5.com/ru/terminal/help/autotrading/mql5