FSX/P3D. You have your mainstream aircraft developers, you have aircraft developers trying to go mainstream, then every now and then a a new team arrives with serious potential. One example was Baytower Studios. If still around today, they would be a leading developer but sadly everything stopped after the RV/7. Another developer showing great potential is MSK known for their Pakistani sceneries. I never knew there was an aircraft manufactured in Pakistan. It is an oddly intriguing looking aircraft and the efforts are really showing. I have missed the last few updates so be sure to catch up on the progress via the source link below. I'm totally getting one!