MacIago
Othello for the Mac, 2001–2008, back in your browser.
How to play
Place a piece so that it closes a line of your opponent's pieces between it and one of yours: across, up and down, or diagonally. Every line you close turns to your colour, and each move has to turn at least one piece. If you can't move, you pass. The game ends when neither side can move, and whoever has more pieces wins.
About
I wrote MacIago between 2001 and 2008, a free game for Mac OS X inspired by David Reed's 1984 Mac game Iago (hence the name). Version 3 rewrote it in Cocoa with a new look and a stronger computer opponent, 3.5 added appearance plugins and 3.6 bigger boards.
This version runs the original rules and computer opponent, ported from C to Rust, on the server. The board and pieces are the 2008 originals.