Tools
DNS Leak Test
Test to determine the server being used to resolve your DNS queries
Estipaper
Fun tool to get a rough time estimate for written work
FreeTSA
freeTSA.org "provides a free Time Stamp Authority. Adding a trusted timestamp to code or to an electronic signature provides a digital seal of data integrity and a trusted date and time of when the transaction took place."
FreeTSA also offers an NTP server and no-log resolvers supporting DNSCrypt(/DNS/resolvers/DNSCrypt.md) or DoT.
Is it down?
Free service to check if a site is down
NTP Pool Project
The pool.ntp.org project is a big virtual cluster of timeservers providing reliable easy to use NTP service for millions of clients.
OpenStreetMap
Free crowdsourced alternative to Google Maps