UMLGraph - UMLGraph is a professional automated drawing tool that allows the designers the declarative specification and drawing of UML class and sequence diagram.
CloudCruiser - Cloud Cruiser delivers cloud cost management and cloud spending management for AWS, Azure, and Google Cloud Platform.
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.
Cloudify - Accelerating Software Development & Deployment
draw.io - Online diagramming application
CliQr - CliQr is a cloud app management platform enabling companies to manage and secure apps onto public, private or hybrid clouds.