Product Hunt - A website that lets users share and discover new products
DeployGate - DeployGate enables developers to distribute beta apps to enable beta testing from fellow developers and community.
Betafy - Where startups meet beta users!
Visual Studio App Center - Continuous everything – build, test, deploy, engage, repeat
Beta Family - 50,000 testers to test your app
Applivery - Mobile Apps distribution system for Continuous deployment, Beta testing, Feedback, Bug reporting & Enterprise App distribution.