ProjectPier is a Free, Open-Source, self-hosted PHP application for managing tasks, projects and teams through an intuitive web interface. ProjectPier will help your organization communicate, collaborate and get things done Its function is similar to commercial groupware/project management products, but allows the freedom and scalability of self-hosting. Even better, it will always be free.
"The Canonical Text Services (CTS) are part of the CITE architecture. The CTS specification defines a network service for identifying texts and for retrieving fragments of texts by canonical reference expressed as CTS URNs."