For a current list of the gears look at hedgewars/uConstants.pas at
the TGearType enumeration.

    TGearType = (gtAmmo_Bomb, gtHedgehog, gtAmmo_Grenade, gtGrave, gtBee, // 4 
            gtShotgunShot, gtPickHammer, gtRope, gtMine, gtCase, // 9 
            gtDEagleShot, gtDynamite, gtClusterBomb, gtCluster, gtShover, // 14
            gtFlame, gtFirePunch, gtATStartGame, gtATSmoothWindCh, // 18
            gtATFinishGame, gtParachute, gtAirAttack, gtAirBomb, gtBlowTorch, // 23
            gtGirder, gtTeleport, gtSwitcher, gtTarget, gtMortar, // 28
            gtWhip, gtKamikaze, gtCake, gtSeduction, gtWatermelon, gtMelonPiece, // 34
            gtHellishBomb, gtWaterUp, gtDrill, gtBallGun, gtBall, gtRCPlane, // 40
            gtSniperRifleShot, gtJetpack, gtMolotov, gtExplosives, gtBirdy, // 45
            gtEgg, gtPortal, gtPiano, gtGasBomb, gtSineGunShot, gtFlamethrower, // 51
            gtSMine, gtPoisonCloud, gtHammer, gtHammerHit);