TM stands for TranslationManager. TM/2 originates from IBM TranslationManager/2 tool and is now available to the open source community. TM/2 is a computer-assisted translation system for translators. See http://www.opentm2.org for more information.
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.