Battle for Wesnoth, one of the oldest and most polished open source games around is now available free on Steam.

The developers aren't just celebrating finding a new audience on Steam, they also just pushed out a big update to the game as well, what they're calling the "New Horizons Update".

They even made a shiny new trailer for the release:

With this new release, they're now requiring you have a registered account on their official forum to play online. They say this is needed as a result of "issues with abuse of unregistered nicknames". They need to fix a tooltip that says it's optional though, which will be in the first point release 1.14.1.

You can see their update notes here, although they have this shiny page to go into a lot more detail about this release. Sounds like a huge amount of work went into it and it's looking really good.

Of course, you can still grab it from the official site, but Steam is very convenient.