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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.
Use this, it downloads the files directly from Steam and puts them in the correct place for you. Only caveat is that you will need to go into the files to delete the models/humans/ and models/weapons/ folders. (If you don't do this you'll be missing some animations/ everyone will have "crotch guns") The SteamCMD method (Which this uses) is the only free and legal way to get the assets.