AmpStamp 1.8.2 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.
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 application lies within Audio & Video Tools, more precisely Music Production. This free software for Mac OS X is an intellectual property of The Musicology Group, Inc.
From the developer:
AmpStamp is an audio processing tool that offers models of vintage effects, amplifiers, speaker cabinets, and reverbs. The goal is to recreate guitar tones heard on classic records. The utility can create tones ranging from classic rock and blues all the way to alternative and heavy metal.
You may want to check out more Mac applications, such as Mixtikl 5, Noatikl 2 - Generative Music Lab or VDMX, which might be related to AmpStamp.