https://carshelpingveterans.org
A couple of years ago, we donated a 1999 Mazda Protege with a little under 100k miles in December. There were some mechanical errors but the car was drivable. It also had a spare tire on it. We left the car unlocked, left the title and keys in the glove compartment, and they came to pick it up while we were at work. They mailed my tags back to me.
I claimed $500 on my taxes but JUST before April 15, I got a letter in the mail that they'd sold it for $900. So I was able to amend my taxes and get a little more money back.
It was so easy. I would do it again in a heartbeat for an old car like that.