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Navigraph is a popular chart publisher for many different payware aircraft addons.
FSPause is a payware application that lets you control your sim via your smartphone.
Saitek produces a wide variety of quality flight sim controls.
PlanG is a VFR flight planner for multiple flight simulation platforms.
SkyVector is one of the most popular flight planner to view aeronautical charts online.
ScruffyDuck Software are the creators of Airport Design Editor, Simple Airport Scanner and BGL2XML freeware utilities.
Simbuddy offers flight tracking, flight stats, and a flight log for your flights. This is both a freeware and payware service.