Moira is not a SIPB project, but it is a critical component of Athena and MIT infrastructure. All mailing lists, all hostnames, user accounts, even printers pass through moira.
Work in progress wiki (ping rgabriel to add more pages)
rgabriel has found out a lot about moira and is one of the most recent SIPB members to find out many details about it. Many SIPB members know about Moira.