List of bitcoin faucets:
Robot fighting game. Requires interaction every 5 minutes. The more you play, the better the rewards.
Earn bitcoins just by keeping the website open in a tab. User interaction is only required when claiming. Can be kept open for as long as you wish.
View ads to earn bitcoins. Interaction required every hour. You gain more bitcoins as you grow your tree. Multiple accounts and proxies are not allowed.
Similiar to robot coin game.
Useful Tools:
You can use tor to have multiple accounts on some faucets. By default you can only run a single instance of tor, but you can use the guide here to run more than one browser.