Frost Dragons; 3m an hour. Antifires that RS gold are normal should do the trick, but you may need to use food.. It is also possible to use a stabbing tool. It requires 85 Dungeoneering and magic notepaper.
Herblore. You can train in normal fashion or join daily warbands to attain the required level. You can make unfinished potions that are made of water and a herb and then sell them. Crafting. Do Shades of Morton. Revitalize the temple and make sacred oil using olive oil and world 88's sacred flame. 1m/hour, and very AFK
Management of Miscellania - Do both quests involving the area, and place 10m (max amount) into. Expect about 160% returns when you use the an appropriate allocation (I do mahogany logs). Player-Owned Ports – Can make millions each cheap RuneScape gold week with only five minutes of work every day. It's going to take for around one year. Additionally, you need to be able to make items and start Ports (level 85-93 is for everything).