Carrd - Simple, responsive one-page site creator.
Waitlist API - Quick and easy waitlist with built in referral.
Responsivize - A must-have tool to develop responsive websites
LaunchList - Create waitlist with referral for your product launch
Cargo - Cargo Collective is a web publishing platform that creates and offers accessible tools online.
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.