LIMP is a small messaging program. It allows the user to check if another user is online and send a message to them. The protocol used is very simple to allow users to program their own client/server for other platforms.
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.