Nice sandbox for understanding the various OAuth workflows
https://oauth.com/playground
Democratic DNS project, adds additional TLDs
https://www.opennic.org
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https://www.linuxbabe.com/mail-server/opendmarc-postfix-ubuntu
Interesting approach to spam blocking in postfix
https://www.linuxbabe.com/mail-server/block-email-spam-postfix
Scope out a charity - including how spammy they are - before donating
https://www.charitynavigator.org
Dump that string into memory (again) and create a resource for it!
https://evertpot.com/222
Neat way to enable serial console on Debian; automatically rolls to systemd, supposedly
https://cweiske.de/tagebuch/serial-console-debian9.htm
Have a USB stick full of Linux ISOs that you can boot, instead of re-writing the same USB over and over again. Wohoo!
https://www.ventoy.net/en/index.html
Verify that you are alive... or at least alive enough to check email.
http://deadmansswitch.org
A website dedicated to swapping paperback books
http://www.paperbackswap.com/index.php
