RailModeller 6.2.6 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 is an intellectual property of Isle of the Kakapo. 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 program belongs to Design & Photo Tools.
From the developer:
Start right away using the numerous supplied libraries featuring more than 6000 elements including the track systems for many popular model railroad brands and model scales:
From T (1:450) and Z (1:220) up to IIm (1:22,5).
Additional libraries include accessories like signals, houses, trees, electric components and symbols for your layouts.
You may want to check out more software for Mac, such as RailModeller Express, which might be related to RailModeller.