From 10-person team in Czechoslovakia, to... a hundred days in Greek prison. Bohemia Interactive are the masters of super-realistic military sims best known for Arma, but there's a lot more to this studio than the famous war game.
PMDG, Fenix, A2A, Bluebird Simulations (757), Leonardo, Horizon Sim and Kuro mods of the default Dreamliner comprise the majority of the study-level aircraft that either are currently available for MSFS or soon have plans to be available. I would probably also throw iniBuilds and the team ...