I use Strava to track my bicycle rides. Below you can see my recent activity.
Last week 4.3 was released. This week 4.3.1 was released.
What's 4.3.1? It's a minor point release to fix some of the issues that made their way into 4.3. How's that for some quick turn around for a release cycle? I know some other .Net "open source" packages don't get releases that quickly! ;)
Download the latest version from www.dotnetnuke.com
This website runs on the best open source content management system, DotNetNuke, it always runs the latest release.