https://driversofsecondlife.blogspot.com/p/vehicle-scripting-info.html
ACS
Karyn Vaher
Everything you need to know about the ACS Vehicle Operating System by here:
http://kcp.wikidot.com/wiki:about
Videos for ACS here: https://www.youtube.com/channel/UCeFe8wDJ06lIsoNWICSiOiw
Keep in mind, the newest video here is 6 years old.
You can purchase ACS on the MP or in world:
https://maps.secondlife.com/secondlife/Panhead/119/184/23
AWorks
Angie Zenga
VOS 1.3 Beta Version 1.3 for land vehicles.
https://marketplace.secondlife.com/p/AWorks-VOS-13-Beta/9926230
http://maps.secondlife.com/secondlife/De%20Campion/4/200/61
Angie is retiring but still around to help.
D2
Eight Blinker
ELR helps build communities of builders and modders in SL's car culture with a tested platform of 'simulator-realism' vehicles, styled on Drift and Track Racing capabilities for consistent, addictive precision action.
Free car builders scripting system. Purchase on the MP or in world.
Linden Labs
Vehicle Tutorial http://wiki.secondlife.com/wiki/Linden_Vehicle_Tutorial
RCX
Lucifera Morningstar
RCX is a free and open source script for planes and helicopters. You can find vehicles at this location: free and for sale. You can simply copy the scripts from any of the free/full permission aircraft into a vehicle you are creating. There is a lack of documentation at this time, but the current owner of RCX is working to rectify this and to create a script distribution package to make things easier.
RCX Productions Wordpress Page
Join the RCX Productions group in world for more info.
https://world.secondlife.com/group/428038ab-a600-6a27-dc70-6f5165c39fcb
RCX Airport
TX Gear Shop
Tech Robonaught
Basic to advanced scripts for land based vehicles.