archival software

Archivist's Toolkit
The Archivists’ Toolkit™, or the AT, is the first open source archival data management system to provide broad, integrated support for the management of archives. It is intended for a wide range of archival repositories. The main goals of the AT are to support archival processing and production of access instruments, promote data standardization, promote efficiency, and lower training costs. Free.
http://www.archiviststoolkit.org

Archon
It automatically publishes archival descriptive information and digital archival objects in a user-friendly website. With Archon, there is no need to encode a finding aid, input a catalog record, or program a stylesheet. Archon's powerful scripts will automatically make everything in the system searchable and browsable on your repository's website! Free.
http://www.archon.org