Obsidian

The only tool I have found that has helped organize my brain and capture everything.  Free with some nice syncing and publishing features if you need them

Obsidian: A knowledge base that works on local Markdown files.
Obsidian – A knowledge base that works on local Markdown files.

Greenshot

The simplest screenshot tool.  The numbering feature is what sets this apart.  A must-have for mockups and communication.

Greenshot
Greenshot - a free screenshot tool optimized for productivity

Easy Retro

Need an easy way to do a retro or a great way to collaborate. It is free and powerful.

Improve your team with fun sprint retrospectives | EasyRetro former FunRetro
Our fun, simple, and intuitive tool will revolutionize your teams collaboration process. Try it today for free and discover how fun retrospectives can help you. | EasyRetro former FunRetro