This was the game which got me into MP-games and by me concidered still today as one of the best (Battlefield-)games ever, if you love this sort of thing.
I have spend seriously more than 1500 hours playing it. (sick, I know)
Now, thanks to a bunch of die-hard fans, Battlefield 2 and 2142 are back with project Revive, releasing it for free online and letting players take part in the game's signature, 64-player sci-fi battles.
Two years ago EA shut down the servers for Battlefield 2142, so there's no official way to play the future shooter these days. This fan revival sees it live once again, with fully functioning leaderboards, in-game ranks and working servers.
It's rather busy too - in fact, the past two weekends have seen the game clock over 1,000 concurrent players.
Though it's legally grey, Battlefield 2142 can't be played by legitimate means anymore, so the developers are probably just happy to see it live on in some form. EA haven't sent any takedown notices, so it's clear the publishers have (untill now) no issue with the shooter living on for free.
You can try it over on the Battlefield 2142 Revive site, where you can download the launcher. Here's a video of someone playing: