Source: http://en.wikipedia.org/wiki/OpenUP
The Open Unified Process (OpenUP) is a part of the Eclipse Process Framework (EPF), an open source process framework developed within the Eclipse Foundation. It provides best practices from a variety of software development thought leaders and the broader software development community that cover a diverse set of perspectives and development needs.
OpenUP preserves the essential characteristics of RUP / Unified Process, which includes iterative development, use cases and scenarios driving development, risk management, and architecture-centric approach.
The most agile and lightweight form of OpenUP, OpenUP/Basic, targets smaller and co-located teams interested in agile and iterative development. Small projects constitute teams of 3 to 6 people and involve 3 to 6 months of development effort.
