Moodle - Moodle is the world's most popular learning management system. Start creating your online learning site in minutes!
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.
Collaborator - Система дистанційного навчання повного циклу із аналітикою в реальному часі та інструментами внутрішнього маркетингу.
draw.io - Online diagramming application
Lessonly - Getting teams up-to-speed and keeping them there.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.