I didn't know where to put it so if it's in the wrong category feel free to move it.
And hope this is not considered spamming
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There are quite a few other great freeware & open source Plane, Car & Ship simulators. There are also some that simulate all the above

Here are just a few.
Car/Racing

Dolphinity Racer

An Open source game that focuses on realism, graphics & simplicity to create your own addons. In that order.


Lamborghini Murcielago roadster cruising Down the countryside.
It starts with one car and one track but there are plenty more. Does your copy of Forza motorsport or Need for speed shift have a car that you would like to see in the game? Convert it for yourself.

Pros  :
Great graphics
Lots of cars
frame rate friendly
I am currently too young to drive but I have taken driving lessons with my dad in the back yard in our Subaru , and It seems pretty accurate and you are also free to adjust the cfg to make it suit your needs.
The price seems pretty reasonable

Cons :
Anything later than 6.5 Wont run on integrated graphics cards. Such as mine .
Needs A bit of a learning curve.
Advice:
Dont attempt to go into corners like you do in nfs. Causes allot of understeer And snap oversteer.
Choose your display settings before you get addons. no need to tell you why

I Am still looking for other freeware ones but when I do I will report back. 

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Flight simulators
I'm pretty sure you know them all but it is worth a shot

Flightgear

Is also an open source sim. Perhaps the most popular of them all

Sorry no need to put the screenie

Pros:
Extreme systems, (e.g full b-1b cockpit, Tomcat rio cockpit modeled, Ability to shoot aim 9's e.t.c)
Many more .

Cons:
Wont run on integrated graphics card.
flight dynamics are not the best,
It's way too cheap for what it deserves
Advice: Dont turn too hard
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Ysflight

Ysflight is a basic flight simulator that can simulate dogfights and Some Civil airliner.


The default planes are a major turnoff .


Yumm, Lunch. Cant say it's a ambush predator


f-22 over Edwards AFB .

Pros:
Excellent framerates<----------------------|
Lots of planes available                            |
Lots of military equipment                         |
(e.g Dogfights, ground attack e.t.c)           |
                                                           |
cons:                                          |
Low detail<-------------------------------|
Default planes are letdowns
Bad flight dynamics(e.g Stalls G forces increase too sensitively)

Advice:
Dont bother with the default planes. No offence soji Yamakawa .
If you do nat know how to install planes reply here and I will tell you.

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Other

Rigs of rods
Does not work on my pc but looks really good
If you know any that i have not put here reply.

Rene