As it has already been pointed out, you can not get a free game that's rated T because free games are not rated. If you want something that is rated you have to pay for it. I guess the exception here is America's Army, which is rated teen and also free.
If you want a T rated FPS, Call of Duty 1-3 were all rated T. Star Wars Battlefront 1 and 2 were rated T. Brink, Quake Live, Monday Night Combat, Battlefield 1942, Battlefield 2, Battlefield 2142, Medal of Honor: Allied Assault, Rainbow Six, and Rainbow Six: Rogue Spear were all rated T. All of the games in the Tribes series (from which we get the torque game engine, the engine Blockland is based on) are also rated T.
If you want free first person shooters, you can look
here. Note that these are almost all unrated. You can't generally have both. Getting rated actually
costs money, so there is no incentive for someone who is not going to make any money off their game to have it rated. Free FPS games tend to mostly be online as well, and online play is not rated.
