If you don't want an app to start (that you don't use), go to settings/applications/ and check "disable".
Some may be starting because you have syncing set within the app, turn it off.
Some just plain run all the time... leave them alone, you're not wasting much battery (unless it's something like Jango taht you didn't exit correctly). Android is designed to have stuff run and not really be "on".
Originally Posted by maker96
I downloaded lot of applications onto my new S3 and the all seem to be running. How can I stop some starting up every time I start my phone,and presumably save battery?