Avalon is an open source media management system that enables libraries and archives to provide access to audio and video collections. It was created to address limitations of existing repository systems in supporting time-based media and existing media systems in integrating with repository functions. Funded by IMLS and Mellon Foundation grants, recent versions have focused on improved access controls, searching, and accessibility. Future development aims to offer Avalon as a hosted SaaS and grow an open source development community.