Nexus - Repository Manager

Nexus manages software artifacts required for development, deployment, and provisioning. Nexus can share those artifacts with other developers and end-users. It is integrated with Eclipse. It stores the content in the file system and no requirement for database. Full text search support is provided by indexing the repository content.

It has ability to proxy Maven repositories. RSS feeds will be generated when ever a new artifacts is added / modified / deleted. Full REST APIs support is provided using Restlet.
Source code location: https://github.com/sonatype/nexus