The most popular GP bots are sorceress garden, LRC and RC.
Although RC is only worth it for double astrals+ because ess has skyrocketed.
Mining concentrated gold at LRC nets me about 150k/hr.
Sorceress garden is around 130k/hr now.
A buddy of mine says double astrals is getting him 300k/hr, although I don't know if that is accurate
You can also use autofighter or whichever fighting bot you prefer and bot monsters. Depending on which monster you choose, you can make around 175k/hr or so. Sorry, but I can't say where I personally do this as then it wouldn't be a secret anymore =/
For F2P, you could do the GOP (Great Orb Project) I've heard that is an outstanding F2P bot, but I have never tried it personally. Anything else in F2P is slow GP and just generally not worth it.