draw.io - Online diagramming application
Sitecore - Sitecore A/S has produced the Sitecore content management system since 1999.
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.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
Salesforce Service Cloud - Service Cloud integrates customer service with social networks and provides a self-service customer portal and knowledge base system.