Libsidplayfp (and its console frontend sidplayfp) is a fork of sidplay2 born with the aim to improve the quality of emulating the 6581, 8580 chips and the surrounding C64 system in order to play SID music better.
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.
