Basically faucet is a land-mark of the Bitcoin eco-system because faucets played a great role in 2009-2010 where you were given 1 BTC just by asking for it.
Nothing like that,it was just the way to keep users lured to the website even if they lost their monies and they needed a little motivation to carry on.
Include Primedice to your list! One of the foundations of Dice site and still running. Their faucet claim has no limit too compared to others (Except if I'm missing something from their update). Bitkong too has a built-in faucet which offers an increase in faucet amount and duration once you paid a certain fee for it. All my suggested site is all play personally by me and already have profit/cashout using only free coin from faucet. You must try your luck too.
They're certainly not the foundations as far as my bitcoin gambling history is not correct.
Bitco.in
Primedice
Why were you asking? Are taking suggestions or just making a list of your own?
Basically appreciating faucet leechers to discover new farms to suck from.