ConvertAll - A comprehensive unit conversion program.

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.

Parsify Desktop - Extendable calculator for the 21st century ⚡

Convert for Windows - Convert is a free and easy to use unit conversion program that will convert the most popular units...

Soulver - Soulver is a software application that functions as a calculator that allows you type a continuous stream of information rather than having to input data into multiple cells.