Great Landing Page Copy - Great Landing Page Copy is a little corner of the internet to find good landing page copywriting examples.
Cruip - Landing page templates for startups
Landing Pages Expained - The best landing pages EXPLAINED by the creators
DesignRevision - Powerful tools for web professionals
Expertpage.io - Create your own landing page for freelancers and consultants
Copytesting - Improve your website copy based on data from your audience