OpenBlox is a cross-platform 3D game development kit that is written in Python and uses Lua as the main development language. Its primary advantage is that no 3D modeling experience is required to use it - you make your worlds with Lego-like bricks.
Open source project that offer summary and download services on this page is a project that carry out their development work on other open source development sites. Their work is linked to this page via a feature called OFI, and their work is not carried out here on OSDN site.