For a current list of the gears look at hedgewars/uTypes.pas at

the TGearType enumeration.

http://code.google.com/p/hedgewars/source/browse/hedgewars/uTypes.pas#89

{{{

    TGearType = (gtGrenade, gtHedgehog, gtShell, gtGrave, gtBee,

            gtShotgunShot, gtPickHammer, gtRope, gtMine, gtCase,

            gtDEagleShot, gtDynamite, gtClusterBomb, gtCluster, gtShover,

            gtFlame, gtFirePunch, gtATStartGame,

            gtATFinishGame, gtParachute, gtAirAttack, gtAirBomb, gtBlowTorch,

            gtGirder, gtTeleport, gtSwitcher, gtTarget, gtMortar,

            gtWhip, gtKamikaze, gtCake, gtSeduction, gtWatermelon, gtMelonPiece,

            gtHellishBomb, gtWaterUp, gtDrill, gtBallGun, gtBall, gtRCPlane,

            gtSniperRifleShot, gtJetpack, gtMolotov, gtExplosives, gtBirdy,

            gtEgg, gtPortal, gtPiano, gtGasBomb, gtSineGunShot, gtFlamethrower,

            gtSMine, gtPoisonCloud, gtHammer, gtHammerHit, gtResurrector,

            gtNapalmBomb, gtSnowball, gtFlake, gtStructure, gtLandGun, gtTardis);

}}}

Note: gtBomb and gtShell were named gtAmmo_Bomb and gtAmmo_Grenade before 0.9.14