TestFlight - iOS beta testing on the fly.
Boombox.io - iOS devs rejoice! Embeddable HTML and hosted TestFlight beta sign-up forms.
Appaloosa-Store - Appaloosa helps businesses maximize the deployment of enterprise mobile apps. Deploy your enterprise app store for Apple iOS and Android apps to employees & testers.
Applivery - Mobile Apps distribution system for Continuous deployment, Beta testing, Feedback, Bug reporting & Enterprise App distribution.
Topcoder - The Topcoder home page has received a slick new makeover that lets new customers quckly login, discover the power of our community, and launch challenges.
Visual Studio App Center - Continuous everything – build, test, deploy, engage, repeat