Zeplin - Collaboration app for UI designers & frontend developers
Abstract - A secure, version-controlled hub for your design files
Mightytext - Send & Receive SMS Text Messages from your computer. Sync'd with your Android #
ActiveWords - Auto correct on steroids
Weekly Update - Quick team status updates.
Google Docs - Create a new document and edit with others at the same time -- from your computer, phone or tablet. Get stuff done with or without an internet connection. Use Docs to edit Word files. Free from Google.