SpeQ Mathematics - SpeQ is a small, extensive mathematics program with a simple, intuitive interface.

ConvertAll - A comprehensive unit conversion program.

Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.

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.

NumWorks - The graphing calculator that makes learning math easier.

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