Gestimer - For those little reminders during the day
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.
Online Stopwatch - Online Stopwatch is free to use online tool that allows you to keep track of the important events and tasks that you are performing.
Parsify Desktop - Extendable calculator for the 21st century ⚡
Timer Tab - Online countdown timer, alarm clock, and stopwatch.
Numi App - Numi is a beautiful text calculator for Mac.