The Indie Stone released a public alpha demo, version 0.1.4c, for their real-time tactical zombie apocalypse game Project Zomboid. While the base release is a Windows package, it is a Java-based game and a forum user helpfully put together a package to make running it on Linux more straightforward.
The demo is (appropriately) relentlessly bleak. I didn’t read any manuals/wiki pages so I wandered around in the rain and the dark, looking for food and weapons. Found food, couldn’t bring myself to eat it (as in, clicking the food mindlessly in my inventory did nothing). No weapons apparent. Saw a zombie. Ran into a neighbor’s house and slept on their couch.
Download (Linux Demo): [ github.com ]