PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
draw.io - Online diagramming application
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.
Predict360 Quarterly Certifications and Attestations - Sarbanes Oxley (SOX) compliance requirements, auditing and internal controls are made easy by Predict360's Quarterly Certifications and Attestations application.
ThinkComposer - Software for create adaptable and multilevel diagrams, concept maps, mind maps and models
OmniGraffle - OmniGraffle is for creating precise graphics like website wireframes, an electrical system designs, or mapping out software class.