Betafy - Where startups meet beta users!
Product Hunt - A website that lets users share and discover new products
Beta Testers Hub - Early adopters network for your Startup
BetaList - BetaList provides an overview of upcoming internet startups. Discover and get early access to the future.
PitchWall - Browse new startups, and submit your mobile app/games startup's beta page here.
Waitlisted - Waitlisted helps new brands and startups build an audience while they focus on building a product