Download of Convertos 2.0.1 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. The program lies within Productivity Tools, more precisely Calculators. The actual developer of this software for Mac is Vitaly Kuz'menko.
From the developer:
Convertos is a unit-converter widget for Yosemite OS panel. It supports many languages for unit names. With this easy to use application you can convert: area, energy, temperature, length, weight, speed, pressure, power, volume, time and many others.
You may want to check out more Mac applications, such as Converto - The Unit Converter, which might be similar to Convertos.