Feature Flux - Ensure your product team is on the same page.
Zeplin - Collaboration app for UI designers & frontend developers
Plant - Version control app and plugin for Sketch
Mightytext - Send & Receive SMS Text Messages from your computer. Sync'd with your Android #
Google Slides - Create a new presentation and edit it with others at the same time — from your computer, phone or tablet. Free with a Google account.
ActiveWords - Auto correct on steroids