Hcash is a Chinese DASH variation. Chinese prefer to have their own, instead of using other's cryptocurrencies. Take a look.
EOS is a project by the developer who build Bitshares and the person who build Steem along with other developers. This is the third project for Dan Larrimer. Dan had a lot of success with Steem and Bitshares.
Districts are marketplaces and communities that exist as decentralized autonomous organizations on the district0x Network. All internet citizens will be able to deploy districts to the network free of charge, forever.
There are many different ways to secure a blockchain. Some cryptocurrencies have a proof of work consensus, where extensive calculations are needed (mining), to secure the blockchain. With proof of stake, the amount of coins, residing on an online wallet have value to be selected more frequently to confirm transactions.
Pinkcoin is a proof of stake cryptocurrency. This means, that the wallet software secures the network. This is done by leaving funds in the wallet, and keep it on line. See more in the video.