A faucet is a website that gives out small amounts of NXT for free. This allows users new to NXT to test their client software and try trading NXT. The user may need to demonstrate that they are human (and not an automated process) by answering a captcha. On another faucet the same NXT account might not be able to receive the free NXT more than once.
If you are receiving NXT for the first time, you'll need to tell the faucet your public key to initialize your account.
For additional information, see the FAQ
Currently available faucets are:
Note that jnxt.org sends only 1 NXT, which is used up as the transaction fee. So you won't receive any NXT from it, but your account will still be initialized.