Older Game Links
this is about the best I'm gonna do for the old games; these are the good links I still had.
Patches for all the games are at Sierra ftp .  Check Mistycreek's site for a bunch of converters etc.

Tracks
Nascar 1
 JasonJohnson <-ICR1 too  - Woof-BSDR  - CAV Editing - Ricks 
N2/99 t
Pontiac Fan - Nascars4 - Mistycreek - Rubbin Racin - IDRS - TMcArthur - WCR - Coast to Coast - Goody's Dash - Degen.X  -Nascarn - MCDRacer - CreativeMotor  - Gator - NascarCreations - N99Hq -  Woof-BSDR  - SRC N2/99 list
N3 / NL
 Pontiac Fan - Nascars4 - Nascarn -Mistycreek - SCW - Corkscrew - Flames - TEU - Freek's - TMcArthur  - TEP - C2C
- Rubbin' Racin'  - NascarCreations -  BST - Nates - Creative - SNE -  Smitty's (NL) -  SSRA -  SRC N3/NL tracklist
Nascar 4
 NNRacer - KingJoe's - W3KN  - Kingjoe2  N4Garage
ICR2/CART
 SRC's tracklist now at Cart Racing HQ
Heat
 Heat Tracklist is at the Mod Squad
Ratbag
 FUO  Blackhole  NoSenseYet  Dirtwizard  GFR  BST  PDTRCARS   Outerchild   Throwinitdown  
GPL
GPL Links     Alt. GPL track database     GPL++   Mirror Zone  TrackWorks  GPL today  Andre's  GPLEA  Van Gossum
GP3 & GP4
 GrandPrixgames.org  Grandprixgames.com
SCGT
 Redbull


Cars
Nascar 1
 Woof-BSDR 
Nascar 2/99
 Bob'sN2 - C2C - Nascar8000 - NR1999fan - PAR - RuRa - SNE - SNEII - Woof  
N3 / NL
 Design Tech - C2C  - Cut&Paste -  DodgeCity - TheDraft - Jeff8372  -  Masons  - Nascar8000 - RedApe - ReedRacing -  SCW  - Rubbin'sRacin - SNEII -  Xrays  - DeepSouth - Smitty's - Nascar3Raceway
Nascar 4
 Design Tech- C2C  - Cut&Paste - Masons - Rubbin'sRacin -  SiteOne - Summers Bros.
N2k2
 Design Tech- RuRa - Summers Bros.
Heat Mods
 Heat Mod list is at the Mod Squad
GPL
 GPLEA  GPL Links
SCGT
 Redbull