AGILE LOCK, its a htc sensation locksreen,works on any android with 2.2 or above
SOUND CLOUD, its a storage for music that DOESN'T store tune on your phone,u set it up once on ur pc,then every tune u download etc u send it to the cloud it then saves it TO THE CLOUD and NOt the device,5gig max,i have 4.6g of tunes in my cloud and it aint takin 0.01% of my memory.
SD MAID PRO,removes ALL **** on ur phone,better than doin it manually through root explorer
ROM CLEANER 2.2,wipes EVERYTHING including sd card,suitable when flashing a new rom
i could list another 50,but i think ppl should LOOK FIRST cos u'll always find the answer on xda or even google
i find out the hard way............by trial and error lol