How to install the latest version on other OSes
Warning: The game is currently under heavy development, and many features are currently missing. This release is an alpha version, not a completed playable game - please check our site and forums for future updates!
cd /usr/ports/games/0ad make install clean
You might also be able to use a graphical utility like package manager for GNOME, searching for 0 A.D. under Games.
You can also install it from the command line with pbi_add:
pbi_add -r 0ad
Compiling on Unix-likes
How to get info on new releases
There are several ways to be notified when a new release is out, as well as getting notified on other updates, either by subscribing to the email mail list, following 0 A.D. on Twitter or Facebook, or the RSS feed.