This last week virtualbox announced that they have released a version of their virtualization software as open source. There is a pay version as well with more features. (*read on for features available in the full version.)
While I appreciate them making the core virtualization open source and currently they are likely the most advanced open source virtualization software out there… it is a bit disappointing to see some of the really juicy features in the non-open source version. However, it should be noted that the full version is free for personal use or evaluation.