PaintPlus 1.3 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 free Mac application is a product of Vu Tien Thinh. PaintPlus for Mac is included in Design & Photo Tools. 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:
PaintPlus is an easy-to-use application to create drawings on a blank drawing area or in existing pictures. Many of the tools you use in PaintPlus can be found on the top tool bar of the window. The program provides basic drawings tools, annotation shapes, and filter effects for image enhancement.
You may want to check out more Mac applications, such as Movie2Shot, Piranesi or DxO FilmPack, which might be related to PaintPlus.