ReloadCMS is a free CMS written on PHP and based on flat files. It does not need any DB installed(!) and realise all abilities of high-level CMS like modularity, templates, users management, advanced rights system and package of main modules.
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.