phpEasyVCS is a simple version control system (VCS) with minimal hosting requirements, namely PHP 5.2+. No database is needed.
Files can be viewed and uploaded with a browser or by WebDAV, which allows you to access the files like a local drive in all operating systems. For integration with other software a REST service is provided.
It is very easy to view the file versions at a specific point in time. The web interface allows you to easily compare file versions and synchronize and merge local files with the files in phpEasyVCS.
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The iF.SVNAdmin application is a web based GUI to your Subversion authorization file. It is based on PHP 5.3 and requires a web server (Apache) to be installed. (+ LDAP integration; no database required)
An attempt at a Xanalogical Web, comprised of a CGI system with both native and HTML interfaces, a set of standards, a backend supporting Transclusion, versioning, and a custom browser with support for Transpointing and editing.