EOS ( 8 ) : As other mentioned, EOS is the one to look at.

It has been designed from scratch to scale, it doesn't have transaction fees and it is damn fast (0.5 sec/block).
Block.one is currently working on an iOS app (Android coming later hopefully :D) that you can use to securely hold your keys in your device and moreover, to be able to actually use EOS tokens.
No more that bullshit of storing tokens and digging them on the ground but actually using them!
In my opinion is the project that seems more likely to take blockchain mainstream to this date. EOS.io is designed in such way that it will allow dapps such as Steemit to run on it. User-friendly usernames like on steemit and more, it's really rich in features!