UMLGraph - UMLGraph is a professional automated drawing tool that allows the designers the declarative specification and drawing of UML class and sequence diagram.
Stackmasters Managed Cloud - Stackmasters provides cloud management and application hosting solutions for private, public and hybrid clouds.
yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.
RightScale - RightScale enables organizations to easily deploy and manage business-critical applications across public, private and hybrid clouds.
draw.io - Online diagramming application
Cloud Automator - Cloud Automator is the tool to automate Amazon Web Services such as EBS backup, start and stop EC2 instances.