Here are 3 of my fav games with a description and a mark out of 10:

1)OGame @ http://www.ogame.net - OGame is a good, simple online games in which you are the leader of your planet, you can form an alliance and try to take over the universe or you can just form an alliance to get trade partners. This game is for everyone. (real time) - 7/10

2)X-Wars @ http://xwars.co.uk - X-Wars is a little more complicated than OGame but is still fairly easy to play, this game is probably for the intermediate OGame player. Pretty much the same as OGame except for you can design your own space ships etc which is good. (Real Time) - 9/10

3)The Colonies @ http://game.thecolonies.net - This game has much more diplomatic and military aspects to it i would recommend this game to advanced OGame or intermediate X-Wars players. (Tick Based) - 9/10

Feel free to add to this list of games and make sure you give a detailed description of what the game is like where it can be found and make sure you say whether its tick based or real time.

Runescape @ www.runescape.com - You take on a role of a fictional charactor and train in wizardy, melee or what ever options there is. and try to work your levels up and become the best ever player of the runescape world, but this website has been around for along time so this will take some doing. - 8/10