Internet Archive - One of the most important sites online, it archives the internet for conservation.

Adobe Color - A very nice color picker from Adobe.

Coolors - Another color picker.

DaFont - A website for fonts.

Tineye - A site to reverse search an image online.

Project Gutenberg - A library of free eBooks with focus on older works before copyright laws.

Marine Traffic - See in real time where sea traffic.

Airliners - Photos of all kinds of aircraft.

W3schools - Site to help you to learn to code.

Windy - Site for weather: wind, rain and temperature.

Ventusky - Another weather site.

Passport Index - See how different passports look and where you can go with them.

Travelscope - Another site for passport mobility.

Ptable - An interactive periodic table.