I've never put too much thought into the tools I use online.
Now that I do, here's a list of the tools that I find useful for:
Frankly the best digital tool I ever found. Continues and continues to grow, and I keep coming back to it even after five years and it keeps getting better: TiddlyWiki
Free forever, easy to use, great functionality
Open Source, Free to use, point scores!
Disroot calls powered by Jitsi
Disroot pads powered by Etherpad Lite
As you can guess, I'm already a fan of Disroot.org
But the site that led me to all these tools is PrivacyTools
For bike and walking routes