LibHunt - LibHunt tracks mentions of software libraries on relevant social networks. Based on that data, you can find the most popular projects and their alternatives.
Board for Github - A webview based GitHub project app with native features
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.
Elegantt for Trello - The most elegant way to manage your Trello projects
GitNews Web - Trending repositories from GitHub, HackerNews & Reddit
Trailer - Accelerate your GitHub workflow