Although the best scripts for these bots are paid, there are free ones that work really good. RSBots can be found here
http://www.rsbots.net/ and autofighter can be found here
http://www.autofighter.org/ . (I recommend using RSBots.net client)
1. On the RSBots.net website, hover over "Support" and click "Download Client".
2. Extract the .rar file (Needs WINrar) and open the Botclient folder.
3. Open the Batch file "Install-Windows" (or the Mac one for Macs..) and download the latest version.
4. Open the "run" Bat, and let it load. (Don't close the black box)
5. Once you get to the auth panel, you can add auth codes which are the bots you can run.
6. Find some bots you want here
RSBots or on the bottom of autofighter.org .
7. Copy the auth code you want, and put it into the auth panel on the RSBots client.
8. Press "Add" and then press continue.