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Garry's Mod Workshop Utility (Easy create, upload.etc).LuaWorkshopper - Quick tool for Addon making and publishing.Garry's Mod Easy Addon Uploader (for Windows only).Garry's Mod Publishing Utility - Java based GUI wrapper.gmpublisher (GUI for Windows, macOS and Linux).Links to such known tools: (feel free to expand)
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You can use alternative tools such as GUIs (graphical user interfaces) made by community members to create, extract and upload addons to Steam Workshop.
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Please see this page for complete set of rules: There are a few rules before you start uploading addons. This article will teach you how to prepare and upload an addon to the Steam Workshop.
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