What is it: The Official Tezos Foundation's Faucet
What it does: It allows you to request daily XTZ at market price (from mainnet)
How many: 1 request per day - 0.01 XTZ per request
How: type your XTZ wallet address (I suggest Tezbox) + your phone number -> Enter verification code -> Done!
That's pretty much it!
Oh, here's the link: https://faucet.tezos.com/