Downloading UMViewer 1.1.2 for Mac from the developer's website was possible 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. This free Mac application was originally produced by Microlinks Technology Co., Ltd. UMViewer for Mac lies within Design & Photo Tools, more precisely Viewers & Editors.
From the developer:
UMViewer is an application built for ViTiny Microscopes only. The utility provides a series of handy features, including remote control, snapshot, video recording, screen flip, and measurement functions. The application has a modern and attractive interface.
You may want to check out more software for Mac, such as Smith Chart for Mac, Movie2Shot or TVPaint Animation, which might be related to UMViewer.