Diagram

BigHairyGoal helps me gain clarity in many different subjects. I love having an overall view of what needs to be done and what has been done

Great, should be ranked first for integrations out of all programming languages. I'm surprised why everybody is not using it.

Free and open source modelling tool for creating ArchiMate models and sketches written in Java.

"Ideaflip is a great mind mapping tool for capturing ideas and building mind maps, though it lacks analytics tools that some teams may require" according to PC Magazine.

Has a lot of features

Great

Easy to use, can generate change script, and has a very good integration with MySQL (incl. PHP app generator). And it's really free (no limits).

After an initial learning curve, you can very quickly draw diagrams and export these.

Gleek is an online tool that supports Flowcharts, Entity Relationship diagrams and UML diagrams.

A lightweight basic drawing application in the Google Drive Suit. Very easy to use for quick drawings and diagrams. Exports to pdf, png, jpg, or svg.

Draw.io is a free web based diagramming and mind mapping software.

Free architecture design, with templates for database, serverless apps, machine learning, compute app, containerized app, etc.

Free Modeling Tool available as Open Source and in a paid version.

I use Gliffy in Confluence. Gliffy is a great way to communicate strategy for website updates to various stakeholders. Gliffy's mindmaps and wireframes have been a game-changer!