LinkedIn Learning - Online training through LinkedIn's professional network.
draw.io - Online diagramming application
Fluany - Everything you need to force your mind to learn
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.
Hackr.io - There are tons of online programming courses and tutorials, but it's never easy to find the best one. Try Hackr.io to find the best online courses submitted & voted by the programming community.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.