draw.io - Online diagramming application
Qualys - Qualys helps your business automate the full spectrum of auditing, compliance and protection of your IT systems and web applications.
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.
Burp Suite - Burp Suite is an integrated platform for performing security testing of web applications.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
OpenVAS - The Open Vulnerability Assessment System (OpenVAS) is a framework of several services and tools...