Epichat for Messenger - Raise your social media marketing to the next level
draw.io - Online diagramming application
Upcado - Super easy to use Messenger Marketing tool for your business
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.
Conte.ai - Conte.ai is a modern web-service for businesses of all sizes from any industry
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.