1. Faucet
You can get any coin with claim it every 1 hour,1minute or no waiting time. Like freebitco.in and freedoge.co.in or Faucethub.
2. Airdrops
Its just like a giveaway to user who participate in their project. Blockchain give free XLM to their member who has tier 2 in their profile and some ICO creating airdrop to introduce their project.
3. Cloud Mining
Mining in website like EOBOT. You can claim GHS everyday to increase your speed mining in EOBOT.
4. Advertise
If you have website with good visitors, you can advertise your website with A-ADS. you can get bitcoin if your visitors click your ads.
5. Social Media
You can earn by posting any Story in Belacam. If other member like your post, you can get free coin.
There are many more ways to earn free cryptocurrency to share in here. like a Bounty, View Ads, Take a Survey, Play a Games, Gambling and many more.
I don't think all this you have listed above are for free, because nothing comes free in life both the cloud mining and advertising airdrop faucet you listed requires one form AF work or the other before the coin are given to you and in most cases their are time consuming and you know time is also money. So I don't think bitcoin and all the other altcoin are given for free you pay for it one way or the other.