Any good freeware games out there?

[Symphony]

Even though I hate most browser games, I have to take my hat off for the Artix Entertainment games. Even though all of them have a membership option, they have a ton of free content.
IMO, the best one is the original Adventure Quest. I've been playing it since early 2005 (although never subscribed and have forgotten my old accounts) and it still amuses me. Free content is released every Thursday and there is already enough free content to keep you busy for months.

There's also AQW, their 'oldest' MMO (it's celebrating their 4th year iirc). The membership system is monthly, but aside from classes, early boss battles, couple exclusive releases every two months and some cosmetic items, you won't be losing much playing free. And it also has weekly releases.
I have resigned my wiki moderator post on March this year, so I can't say if they have changed much on the mechanics. If they haven't, you'd have some hard time starting to play from scratch, as their tutorial sucks.