Full disclosure: I work at OpenNebula. We believe OpenNebula is a very good alternative to OpenStack. It's a completely open source product, with many strength

Full disclosure: I work at OpenNebula. We believe OpenNebula is a very good alternative to OpenStack. It's a completely open source product, with many strengths. Very easy to setup and to maintain, without the big mess that is required by OpenStack. Plus, users don't get caught in all the politics (lots of vendors pulling in their direction). I certainly recommend you check it out.