Download of Aquarelo 1.3.6 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. Aquarelo for Mac is included in Developer Tools.
This software for Mac OS X is an intellectual property of Giovanni Maria Cusaro. 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:
Aquarelo is an application that helps you improve, convert and scan your colors. You can share colors from different software apps to Aquarelo and vice versa. Aquarelo has the ability to convert your values into 36 standard color formats. In addition, you can send a color directly to Photoshop CC and Illustrator CC.
You may want to check out more Mac applications, such as RAGE Domainer, Multisite for iWeb or konqueror, which might be related to Aquarelo.