Hygger - Hygger - is an Agile project management tool with built-in prioritization.
Product Hunt - A website that lets users share and discover new products
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
AlternativeTo - AlternativeTo lets you find apps and software for Windows, Mac, Linux, iPhone, iPad, Android, Android Tablets, Web Apps, Online, Windows Tablets and more by recommending alternatives to apps you already know.
Validated ideas - List of 5,000 poorly executed but popular apps
BetaList - BetaList provides an overview of upcoming internet startups. Discover and get early access to the future.