Rlab is a high level math program that uses it's own C like language to aid in the devlopement of math intensive applications. Rlab is similiar to (but not a clone of) Matlab.
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.