I found the source for ralgcm here: http://freeware.nekochan.net/source/ralcgm/ but this cannot be used due to licensing issues.
But good news! I did not check the delegates.xml file before and just assumed we needed ralcgm. But ImageMagick uses 'uniconvertor' and you can download that here: http://sk1project.org/modules.php?name=Products&product=uniconvertor&op=download. I hope this can help you replace the commercial product you are using. It is using an 'LGPL' license (https://github.com/sk1project/uniconvertor/blob/master/COPYRIGHTS) so you can use it in a commercial product.
But good news! I did not check the delegates.xml file before and just assumed we needed ralcgm. But ImageMagick uses 'uniconvertor' and you can download that here: http://sk1project.org/modules.php?name=Products&product=uniconvertor&op=download. I hope this can help you replace the commercial product you are using. It is using an 'LGPL' license (https://github.com/sk1project/uniconvertor/blob/master/COPYRIGHTS) so you can use it in a commercial product.