draw.io - Online diagramming application
RookieUp Career Bootcamps - Tools to help designers build great portfolios and get jobs.
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.
Foreword - High impact workshops to help you thrive at startups
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
Nora - A Notion template that actually solves painful problems of project management in Notion instead of looking beautiful.