Just updated it!
Why didn't you share the URL to sign up in the article
OMG! this is awesome!
Marmoset announced a new beta build for Toolbag 3.03. A new post appeared on Facebook with the big highlights for the new build including Mac support and Python scripting. They also improved the refraction shader (double sided refraction and masking in albedo alpha), added a uniform AO option and got rid a number of bugs.
The Mac version of Toolbag 3 is said to have a brand new renderer and many other systems. If you find any problems, let the guys know, and make sure to mention you were using the Mac version, so the team can deal with the problems.
Simply log in with your Marmoset ID to start using the build if you own a license. If you don’t have one, the beta will start in trial mode.
You can now write scripts to do all manner of useful things. From simple automation to more advanced plugins, Python is said to give extensive access to Toolbag’s feature set. The Edit menu will now feature a Plugins section, where you can run example plugins and open the default folder to check out how the code is structured.
Check out the official documentation to get started with Python scripting here.
You can find more information and find the download links in the original post here.