They offer a free trial version that never expires, though it does add a watermark to the final images.

A complete workflow for HDR imaging that supports a wide range of HDR formats and tone-mapping operators.

Includes a dedicated HDR Merge persona that is often cited as one of the best alternatives to Photomatix.

If you are looking for high-quality HDR (High Dynamic Range) processing, here are the safest and most effective ways to access Photomatix or its alternatives: 1. The Official Path (HDRsoft)

While primarily a RAW editor, it has advanced tools for handling high-dynamic-range files and exposure blending. 3. Built-in HDR Tools