Mightytext - Send & Receive SMS Text Messages from your computer. Sync'd with your Android #
Tweetlet - Tweetlet is a free tool that lets you create beautiful images from your tweets, text, and any other images in a snap.
ActiveWords - Auto correct on steroids
Twidy App - Tinder for Twitter - Tidy up and declutter your timeline
Zeplin - Collaboration app for UI designers & frontend developers
Snap a Tweet - Snap a tweet with this little tweet screenshot tool.