Unbounce is probably the most popular solution on this list. Their content marketing is very effective and many marketers consume their blog posts or ebooks even if they're not customers.
The landing page builder is a rocket, both in strength and control panels. The editor greets you with dozens of buttons and panels and can be overwhelming for the beginner marketer. That's the main reason Unbounce doesn't get a full five star rating.
Lots of integrations, templates and control over the Javascript and CSS code make Unbounce a complete tool and a go-to for many professionals. Plans start at $79/month and there's a 30-day free trial as well as a preview of the editor that doesn't require any prior information to be entered.