What are yours?
Obsidian - Note-taking desktop app with a nice UI, good extensions, tagging, and more.
Leechblock - Browser extension that blocks certain sites during specified time periods. I've got a similar app on my phone, but its free version only allows 3 apps to be blocked.
Mylifeorganized for infinitely customizable, hierarchical, advanced GTD-like to do lists.
Atimelogger (Android) for time logging, to see where my time goes and prevent procrastination.
OBS studio and Otter.ai for meeting recordings and notes.
On software side a good IDE is really helpful. Jetbrain really excels in this field.
It's incredible how far you can get with a good editor config