Yeah, there's a lot of good freeware games out there. Good for when you're bored on your PC and want a quick game of something.
Here are the best freeware games I currently have (I recommend you check them all out):
- Noitu Love
- Noitu Love 2 (somehow manages to better the original, but only a demo at the moment)
- Madness Interactive
- N (N+ is coming out on the DS and Wii sometime soon, so you may want to check the original out first)
- Acid Bomb 2 (really good puzzler)
- Osu! Beat Game (just an EBA-style game with custom songs)
- Frets on Fire
- Samorost
- Samorost 2
- Cave Story
- The Underside (just like Cave Story)
- Fancy Pants
- Fancy Pants 2
I'm also a big fan of Nifflas' games (creator of Knytt Stories). Knytt, the prequel, is worth checking out. Within A Deep Forest has to be one of my favourite games to date as well (the fact I enjoy it more than many 2D Mario games is a testament to that), and you absolutely HAVE to play it. In fact, most of his library of games is worth checking out.
On that subject, Nifflas has already confirmed he is working on "Skymning", which will likely come to WiiWare sometime next year. I guarantee it will be a smash hit. And his other project "Night Game" looks amazing so far. A physics-based puzzle/adventure game where you play as a ball. It's very stylised, in that everything is depicted at night.
Anyway, I'll stop ranting and raving. FreeWare games can be better than commercial games in rare cases, so they're most certainly worth checking out.
EDIT:
I forgot one hehe. An incredibly old game now, but interesting enough to check out. Facade was a revolutionary game that even featured in many newspapers. A group of French university students created a scenario in which you must talk your two "friends" (two CPU players, with randomly-generated dialogue) and save their marriage. It's hard to describe, but the fact the AI is reasonably clever enough to respond intelligently to what you type is quite frankly awesome. It can also create a few laughs when you swear at them until they kick you out, start snogging one of the partners, and generally do stuff you wouldn't do normally.