If you have a modern browser and need to avoid doing important things like eating and sleeping then one-more-click here:
https://play.freeciv.org/webclient/?action=new&renderer=webgl#
More info about what this is, plus Multiplayer etc:
What’s new is the ‘WebGL’ enabled version is out now in beta and seems to work nicely. Zoom in/out of the map, select a unit and choose move/build etc. It’s Civilization…
Source code here for those into that: