“Taking the Rational Out of RUP“, an article from SD Times, explains how Unified Process is moving well beyond its roots, with the new Essential Unified Process (EssUP), a lightweight variation developed by Ivar Jacobson, and Open Unified Process (OpenUP), the Eclipse Process Framework software development process.

Both sets of best practices are not simply variants, they have been written from the ground up, and they share a common goal of streamlining software development and moving agile practices in the mainstream

Others re-purposed methods not included in the article are Agile Unified Process (AUP), a simplified version by Scott Ambler, and Enterprise Unified Process (EUP), an extension of the RUP for enterprises.