The 4.09 version of LUTCalc for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
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. The software lies within Design & Photo Tools, more precisely Viewers & Editors. The actual developer of this software for Mac is Ben Turley.
From the developer:
LUTCalc is a desktop app for generating, analyzing and previewing 1D and 3D Lookup Tables (LUTs) for video cameras that shoot log gammas. LUTCalc understands almost all log flavors in use today, plus standard gammas such as Rec709 and manufacturer-tuned versions.
You may want to check out more software for Mac, such as Smith Chart for Mac, HDR MAX or Digital Studio v5, which might be similar to LUTCalc.