BuiltWith - Find out the technology behind websites

Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.

Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.

Influitive - Influitive helps companies increase customer lifetime value and accelerate sales with the power of their own customer advocates. Inspire your customers to stay longer, share their experiences, and attract new business.

What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.

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.