Taskade - Make lists, organize your thoughts, and be inspired to get things done. Taskade is a collaborative space for your tasks.
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.
FigJam Task Prioritizer - Plan and prioritize your daily design tasks on FigJam
draw.io - Online diagramming application
Freework - An easy way to keep track of your daily work
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.