Product Hunt - A website that lets users share and discover new products
TestFlight - iOS beta testing on the fly.
Betafy - Where startups meet beta users!
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.
BetaList - BetaList provides an overview of upcoming internet startups. Discover and get early access to the future.
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.