SwiftKit

SwiftSwitch (Abbreviated as SS,) is a World Switching Program released by Jason Fah. The program lets you do many different things, including choosing to go the the most or least populated world, acsess to quick guids, located at Zybez Runescape Help. It has a built in IRC client to use with chatrooms.

Legal or Not?
There is much contreversy as to wether SwiftSwitch is a legal program or not. Before, they had blocked the adds for F2Players, and this is agains JaGeX rules. In the newer version, adds were put in, making it legal for Free-To-Players.