draw.io - Online diagramming application
LinkedIn Learning - Online training through LinkedIn's professional network.
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.
Always Learning - The best resources for learning programming and design
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
Udemy - Online Courses - Learn Anything, On Your Schedule