CoCalc 1.1 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This software for Mac OS X is an intellectual property of Bytewizard Ltd.
The program lies within Productivity Tools, more precisely Calculators. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software.
From the developer:
CoCalc is a lightweight calculator app for everyday use. The window's transparency is adjustable and can be enlarged easily. The program lets you to save or print the whole calculation. The tool allows you to switch quickly between basic and scientific modes.
You may want to check out more software for Mac, such as RubyCalc or InstaRate, which might be related to CoCalc.