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CSSource-Texture-Installer
A utility designed to help make installing CSSource textures into Garrys Mod safe while also doing it the legal method by utilizing steamcmd.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
This is the best method and 100% legal as it used SteamCMD to download the assets directly from valve. Only caveat when you use this (or any method that isn't using gmods mounting system) is that you will need to delete some files after its finished installing. Delete the models/ weapons folder and the models/ humans folder. If you don't delete these you will have the crotch gun bug and be missing gmod specific animations like swimming or noclip floating.