FutureLearn - Free online courses from top universities and cultural institutions
calculator.net - Online calculator for quick calculations, along with a large collection of calculators on math, finance, fitness, and more, each with related in-depth information.
Free Code Camp - Learn to code by helping nonprofits.
GPACalculator.io - The easiest way to calculate your GPA
Mindvalley - Mindvalley is an online education platform that facilitates users by connecting them with numerous strong-minded people worldwide and sharing knowledge or ideas through chatting, meetups, and video calls.
Unigradecalc - Unigradecalc is a website that provides a tool for calculating GPA (Grade Point Average).