Numi App - Numi is a beautiful text calculator for Mac.
Tweetbot - Sync your timeline across your iPhone, iPad, and Mac. Mute tweets by user, hashtag, tweet source, or keywords (including regex). 3rd Party support for image, video, read later, and timeline sync services.
ConvertAll - A comprehensive unit conversion program.
Elk - The fastest way to convert currencies on mobile.
Calculator++ - Calculator++ is an advanced, modern and easy to use scientific calculator.
Simple Online Tools by Solvid. - A collection of simple and handy online tools.