Chocolate Software
FSHost
(host a Flight Simulator session for FS2002, FS2004, and FSX)
FSHostSpy
(find FSHost sessions)
FSHostClient
(connect FSX to an FSHost session)
FSChatScroll
(fix the chat window in FS2002)
SBRelay
(use FS2004 with SquawkBox 2)
FSRace.dll
(for PROPS air racing with West Coast ATC)
Flight Simulator Multiplayer Tutorial