Ciso is a small tool to compress your psp iso to cso format. It was originaly coded by Booster, the famous coder of Devhook for the PSP. Since Booster isn't maintaining his sources anymore, you can find them below.
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.