Zylo - Zylo helps organizations optimize their SaaS investments by providing insights around Spend, Utilization, and User Feedback.
draw.io - Online diagramming application
Blissfully - Blissfully offers solutions to track, manage, and optimize SaaS spendings.
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.
Zluri - SaaS Management and Identity Governance Platform for IT Teams
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.