Just need to throw something, anything, up for a landing page? AppStop has your back:
Create a landing page for your iPhone app, using the info you’ve already submitted to the App Store
Just enter an App Store URL below, and I’ll generate a customizable landing page for your app, that you can fork on GitHub and deploy on github.io or your own domain…
You can also scrape info from iTunes Connect for unreleased apps. So if you want to do some A/B testing on possible descriptions, screenshots, etc. this would be a pretty darn convenient way to go about setting that up, looks like!
h/t: iOS Dev Tools Weekly!
Applandr makes a landing page out of your store listing
Check out BoardingBot for landing page and beta management
Or if you want a really simple landing page … How to Use Instapage to Create a Landing Page (Without a Dev)