LDView is a 3D viewer for LDraw LEGO models with a focus on quality rendering with good performance. It also contains many features geared specifically toward LDraw part authoring.
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.