I'm a huge fan of Neil Patel, huge (I'm a proud owner of a signed copy of his latest book) and I'm glad he's put Quuu as the first tool on the list. It's amazing. 

When we've had content accepted by their editorial team, it's been a great driver of traffic and traffic that stuck (with good dwell times and low bounce).

The rest are great too, and if you want a 10th, I'd suggest Zest.is which a chrome plugin.