to start with see the popup menu beside the search field, change that to My Processes.
The rest belong to OS X and are not your to go quitting.
This is how Unix works, it has lots of processes running and they use little RAM and no CPU when not in use. The RAM may even be paged out to the Harddrive.
There is no one place that lists all the processes, Apps, Drivers and OS X can spawn these anytime. Some of them you force quit will just re-spawn.
This is NOT how you manage OS X memory.