FAQ:What is a nightly build?
A nightly build is a build that reflects the current state of the source code. Each night a script runs and creates an executable including the latest changes. This is a great way to preview the latest improvements we're making and to test fixes to bugs that have been checked-in between releases.
If you're downloading a nightly please don't expect things to work 100%. We make them available to you so you can try things out and report any bugs that you find. This process helps us ensure our final releases are the best they can be.
This said, late in the development cycle, we will often recommend the nightly build over the stable release.
Nightly builds can be found at: http://download.tuxfamily.org/makehuman/nightly/