Noizio is the minimalistic background sound equalizer for Mac OS X, that will increase your working productivity or ability to relax.

FocusList is a productivity app that helps you get more DEEP work done. Plan your day with timeboxing, stay focused with Pomodoro technique and track your time with our advanced stats.

Numi is a handy calculator app for macOS. It allows to describe tasks the natural way and instantly get an accurate answer. For example, $20 in euro - 5% discount or today + 2 weeks