draw.io - Online diagramming application
Puppet Enterprise - Get started with Puppet Enterprise, or upgrade or expand.
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
Packer - Packer is an open-source software for creating identical machine images from a single source configuration.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
Terraform - Tool for building, changing, and versioning infrastructure safely and efficiently.