AdventuresPlanet.it has a good collection of Free Games, if a little confusing to download. ::)
Anyway, they've got some TSL Episodes, along with a couple Broken Sword fangames, and the like.
www.AdventuresPlanet.it/freegames.php
Make sure to check the Lingua column for Inglese, if you want English games. :)
If you know of any other freeware game sites, feel free to post.
Don't forget www.AdventureGamers.com's Freeware section.
Well here are some more suggestions, though not adventure games:
Envirobear 2000: Operation: Hibernation (http://gamejolt.com/freeware/games/action/enviro-bear-2000/211/)
- You're a bear driving car in the woods trying to find food before winter arrives.
Games by Cactus (http://cactusquid.com/)
- This is what happens when insanity meets Game Maker.