These days it seems like you can't move three feet in the MMO space without bumping into a Free-to-Play (or F2P) game. As the person who writes First Impressions from time to time, I play quite a lot of them. As such, I'm always looking at new F2P games that pop up, from tiny indie titles to mega-corporate offerings. Just about any subset you can imagine is represented out there: flash games, isometric, side-scrollers, mini-games, embeddable web-only, local client. Curious about what genres you might find? How about fantasy, steampunk, post-apocalyptic, casual, cartoon, pirate, anthropomorphic, space, and so much more. If it hasn't been made yet, wait six months - someone will probably do it, considering. Quality, too, runs the gamut. Some games are incredibly addictive, while others make you want to take a run at the dev team with a sock full of quarters.