Reverse Dictionary - Describe a concept and get back a list of words
Median.co - Median.co (formerly GoNative.io) is the industry leading solution used to build iOS and Android webview apps. Get started for free and turn any website into a full-feature mobile app in seconds.
Silicon Valley Dictionary - Urban dictionary meets Silicon Valley
AppConvertly.com - AppConvertly - convert your website to Android & iOS app. No coding required. Easy solution to reach new audience in 5 minutes https://www.appconvertly.com/
Dictionary Anywhere - Dictionary Anywhere is an open-source and easy-to-use browser extension for Mozilla Firefox and Google Chrome that allows you to check definitions easily while browsing the web.
Decidr - Make better decisions with quick A/B polls