Boardgamecore has a few games coded for free, online play on their site and one of them happens to be one of my favorites: Wir Sind Das Volk!, which covers the 4 decades of German Cold War history leading up to reunification. One player takes the East, one the West, and both try to prove the superiority of their systems via various progressive or repressive ways. See below for more details:
https://boardgamegeek.com/boardgame/165401/wir-sind-das-volk
http://www.histogame.de/WSDV/Wir.sind.das.Volk.Rules.pdf
http://play.boardgamecore.net/
Anyone interested in playing a game on there? The game enforces all the rules and allows asynchronous play. It is without the e-mail reminders of Yucata, but I usually just keep a tab open of each of my games because there is a little reminder noise that pops when it's your turn.