MGE is a project that wraps the various DirectX dlls used by Morrowind. Despite it's name, it wraps the input and sound dlls as well as graphics. It also interfaces with MWSE to make even more functions available to modders.
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.