CliQr - CliQr is a cloud app management platform enabling companies to manage and secure apps onto public, private or hybrid clouds.
Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
Flexiant - Flexiant is a software company that gives its facilities in providing specific cloud-based systems and manages its functionalities in the best way.
draw.io - Online diagramming application
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.