Carrd - Simple, responsive one-page site creator.
Waitlist API - Quick and easy waitlist with built in referral.
Landing Pages in MailChimp - Easy to build, custom landing pages for free
LaunchList - Create waitlist with referral for your product launch
Bumble - Bumble is a social network that allows you to feel empowered while you make those connections, whether you’re dating, looking for friends, or growing your professional network. One first move on Bumble could change your life.
Waitlisty.io - Build excitement for your product by embedding a simple form into your website. Signups will receive a referral code to share with their friends. The more codes they share, the more they climb your waitlist.