FITS Preview 5.19 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 Mac application was originally designed by CloudMakers, s. r. o. We recommend checking the downloaded files with any free antivirus. The software lies within Design & Photo Tools, more precisely Viewers & Editors.
From the developer:
FITS Preview is a lightweight and fast viewer for images in FITS format (Flexible Image Transport System) introduced by NASA and HEASARC. The viewer is based on CFITSIO library and supports all standard monochromatic and color FITS image formats. The viewer can flip, rotate, debayer image (automatically if offsets fields in header are set correctly) and export images to JPEG format.
You may want to check out more Mac applications, such as FITS, Touch Bar Preview or Get Fit Stay Fit, which might be similar to FITS Preview.
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