Recommended sites

This is a recommended list of sites; it can and will be updated

* https://boardspace.net -- huge collection of abstract games. Free and open source
* https://18xx.games -- economic train games
* https://boardgamearena.com/ -- huge collection of modern games, but need friend with Premium account to host some games (I have premium)
* https://cardgames.io -- many classic card games, but sadly likes to drop connections :-(