Older Game Links
this is about the best I'm gonna do for the old games; these are the good links I still had.
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 -  Coast to Coast - Nascarn - MCDRacer - CreativeMotor  - Gator - NascarCreations - N99Hq -  N99 - SRC N2/99 list
N3 / NL
 Pontiac Fan - Nascars4 - Nascarn -Mistycreek  SCW - Corkscrew - Freek's -  TEP - C2C
- Rubbin' Racin'  - NascarCreations -  BST -Creative - simecditors -  SNE -  Smitty's (NL) -  SSRA -
 SRC N3/NL tracklist
Nascar 4
 NNRacer - KingJoe's - W3KN  - Kingjoe2  N4Garage  - NORL 
ICR2/CART
 SRC's tracklist now at Cart Racing HQ
Heat
 Heat Tracklist is at the Mod Squad
Ratbag
  NoSenseYet GFR  BST  PDTRCARS    VLR
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
  C2C  - Cut&Paste -  DodgeCity - TheDraft - Jeff8372  -  Masons  - Nascar8000 - RedApe - ReedRacing -  SCW  - Rubbin'sRacin - SNEII -  Xrays  - DeepSouth - Smitty's - Nascar3Raceway
Nascar 4
 C2C  - Cut&Paste - Masons - Rubbin'sRacin -  SiteOne - Summers Bros.
N2k2
 - RuRa - Summers Bros.   Dukes
Heat Mods
 Heat Mod list is at the Mod Squad
Ratbag
  NoSenseYet GFR  BST  PDTRCARS    VLR
GPL
 GPLEA  GPL Links
SCGT
 Redbull