Jan Willem Nijman's 4 Hour RPG (or 4hrpg) which began life as an entry into The Poppenkast's Four Hour competition is slowly but surely expanding into a full RPG experience. It has now entered open beta and anyone who signs up at the official forums can download the latest build.

9 months in the making - and counting! - it's grown quite a lot since Tim first spotted it. Definitely worth giving a download, especially for all you stat-grinders out there.