Remember dont hack or steal or use other peoples wifi as it is illegal.
cow patty (free)sourceforge.net/projects/cowpatty/
cow patty uses a dictionary attack (weak passwords) to hack wifi passwords
wirelesskey view (free)www.nirsoft.net
nirsoft has all kind of free softwares for passwords and stuff
Tor helps with privacy
mad macs (free)
mad macs is a mac adress randomizer