Games & Conceptors:
Image Space Inc
rFactor

Modding Teams:
Virtua LM
HistorX
CSGT
DRM

Online Communities & Simracing Clubs:
Simjunkies
RaceConnect
RaceDepartment
Simracing Club Ukraine
The Way I Play
SimRacingOnline

Inspiration:
Le Mans Classic
24H du Mans