Timestream Saga. The "Xenogears" of all OHR games on account of its length. Filled with more Squaresoft and Final Fantasy Cliches and ripoffs than you can shake a lawsuit at. Prequel to TSSE, and Final Fantasy H, one of the most famous Final Fantasy Fangames ever made.
Update: Now updated with the Uberzetsung player, so you can hear the music as it was intended!