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)
ADISS (Active Directory Interface for Subversion Security) provides a means to automate the maintenance of Subversion authorization configuration files based on membership in Active Directory groups. Written in PHP with a Mysql database.