Octagons (no BGG entry that I know of) is a similar game to Hex where the players Black and White are trying to connect their sides of the board. On your move you may claim a half-octagon or two small squares. The first player to connect their two sides wins.
Note that with many of these connection games there's a strong first player advantage (if the first player is smart enough). The usual solution is for someone to make the first move then the other player chooses whose move that was. This encourages the smart enough move maker to make a move which is not too strong as the first move.