TestFlight - iOS beta testing on the fly.
Product Hunt - A website that lets users share and discover new products
Boombox.io - iOS devs rejoice! Embeddable HTML and hosted TestFlight beta sign-up forms.
Betafy - Where startups meet beta users!
Visual Studio App Center - Continuous everything – build, test, deploy, engage, repeat
BetaList - BetaList provides an overview of upcoming internet startups. Discover and get early access to the future.