www.rsbuddy.com is a very simple bot to set up, you register, and then go to their script repository, and add the bots you want on your client!
www.rsbots.net is a slightly more advanced bot, and is NOT free. Each bot costs between 8-25 USD. Although these are MOSTLY superior to all the free bots, they are expensive. Once you purchase a bot, you Will recieve an Auth code, that you simply copy and paste into your client, which is available on the rsbots.net website.