DeployGate - DeployGate enables developers to distribute beta apps to enable beta testing from fellow developers and community.
Product Hunt - A website that lets users share and discover new products
Applivery - Mobile Apps distribution system for Continuous deployment, Beta testing, Feedback, Bug reporting & Enterprise App distribution.
Betafy - Where startups meet beta users!
TestFlight - iOS beta testing on the fly.
BetaList - BetaList provides an overview of upcoming internet startups. Discover and get early access to the future.