This one is available for free on Abandonia.com. Legal too. Great game if you like to play hot-seat strategy games with up to 5 players. Combat is real-time. You control one unit in the battle, kind of like a top down action game, and the next one when\if the first one dies.
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Sonic: After The Sequel. A Phenomenal fangame that captures what made the 2D games great. A very strong soundtrack, some neat gameplay changes, and the new locations(Cyan City in particular) are gorgeous.