These are screenshots of the desktop version of Freeciv:
Freeciv 2.6.0 beta playing the Europe 1901 scenario.
Freeciv 2.4 and 2.5Edit
Small 2.4.2 spaceship (7.9 years)
2.3.1 in Polish. Hexagonal topology and hex2t tileset.
2.5.0-beta1 town (pop 34)
2.1.0-beta3 SDL client - an early Swedish settlement
2.1.0-beta1 Simplified Chinese locale - observing a game, still in the early ages.
2.1.0-beta1 in English - nice view of big Icelandic cities. :)
2.1.0-beta1 in the 19th century, fullscreen window view.
Spaceship dialog in 2.1.0-beta1.
2.1.0-beta1 in Norwegian.
2.1.0-beta2 SDLClient running at Zaurus SL-C3100
2.1.10 GTK2 Client, Trident tileset - observing a random game
Freeciv 1.0, featuring the XAW client.
See also Freeciv-web and Freeciv WebGL screenshots.