Rhey were once the leaders in the cockpit sidtware market, but is now history.
They do have an airbus suite operating, but it's outdated. Their 737 is utter **** compared to the Prosim737 suite.
For 737 there is really only one choice.
For 777 you have Sim-Avionics. 767 can be based on LevelD and sioc.
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