I really like this square world map which has very interesting properties, made by a small french non-profit for educational purposes: https://nuees.net/planisphere/
I don't think they have an english version of the site yet, but Youtube does an ok job at auto-translating the explaining https://www.youtube.com/watch?v=10rY7y5ys-g (it fucks up every other thing, but you get the overall meaning)