Strikingly is not a standard landing page builder, but it does specialize in one-page websites so it gets a spot on this list.
With the Pro plan ($16/month) you can create up to 20 pages, but single page websites are what Strikingly does best. It's very easy to find your way around the admin area and the templates, although few in number, are quite eye-grabbing.
Use this one if all you want is a one-page presentation website, but know that you can do lots of things on that one-page like sell products or show a portfolio.