Yellow Dog Linux (YDL) is a free and open-source operating system for high-performance computing on multi-core processor computer architectures. It focuses on GPU systems and computers using the Power Architecture (POWER7). YDL is currently developed by Fixstars (which acquired Terra Soft Solutions in October 2008). Yellow Dog Linux was first released in the spring of 1999 for the Apple Macintosh PowerPC-based computers. The most recent version, Yellow Dog Linux 7, was released on August 6, 2012. Yellow Dog Linux lent its name to the popular yum Linux software updater; yum was derived from Yellow Dog's yup (Yellow Dog Updater) and thus called Yellowdog Updater, Modified.