As far as I know, these are the only types of stock production doors that have ever been made. If you can think of any more, let me know.
1. Standard Doors - (Example: Lotus Elise)
2. Linear External Sliding Doors - (Example: Toyota Sienna)
3. Coach ("Suicide") Doors - (Example: Lincoln Continental)
4. Scissor Doors - (Example: Lamborghini Diablo)