Runeclicker

RuneClicker is a free idle RPG that runs in your browser. You pick something to train, it runs while you do other things, and what you gather feeds back into the rest of the game. 

There are 24 skills to take from level 1 to 99. Woodcutting, Fishing, Mining, Smithing, Runecrafting, Farming and the rest each have their own methods that unlock as you level, and the outputs chain together. Ore becomes bars, bars become gear, herbs become potions. 

There are 160 quests with real requirements and rewards, 40 bosses with their own drop tables, and clue scrolls in six difficulties from beginner to master. Gear you find can be equipped, banked or sold. 

Everyone plays on one shared server. There is global chat, leaderboards, a player marketplace, direct trading, mail and clans. Achievements are announced to the whole server when you earn them. 

Your character keeps training for up to 12 hours after you log out, scaled by your Agility level. 

Two harder modes are available. Ironman blocks trading and the marketplace, so everything you use you made yourself. Hardcore ends the run when you die. 

Membership is optional and costs $2.99 a month for one character, $5.99 a month for the whole account, or $59.99 for the year. It adds convenience and cosmetics. Everything that matters for progression is in the free game.