WARNING :
On the web there are so many softwares called gmail hacker software, facebook hacker software.
But in reality there is no readily available software to hack accounts infact hacking anyone's account is not at all an easy task that can be done with just one click.
So never download such rubbish. Most often they contain virus(Trojan) files hidden which gets installed when you run such softwares and send all your valuable info such as your saved passwords, cookies, keystokes, credit card information etc. to some hackers and you are the ultimate sufferer.