In Garry's Mod (GMod) , "Onetap" typically refers to third-party tools or "downloader mods" designed to simplify the downloading of game assets and addons.

: Accessible via the "Workshop" button in the Steam overlay (Shift+Tab) to find and download addons instantly.

The most prominent feature associated with Onetap tools for GMod is the ability to without needing a Steam account or client. Key Useful Features

These tutorials demonstrate the standard one-click methods for downloading and installing GMod addons: How To Get Mods In Garry's Mod (Gmod) - Step By Step YouTube · GuideRealm