Userscript.Zone Search is a website that allows searching for userscripts by entering a matching URL or domain.

• Many scripts
• It is very easy to find matching userscripts
• Only user scripts from moderated userscript pages or at least pages with a comment function are displayed

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GreasyFork is maybe the most popular userscript hoster. It has many scripts in its inventory and is created by Jason Barnabe, the author of Stylish.

• Many scripts
• Features like script sync from Github
• A very active open source development

OpenUserJS started right after GreasyFork. It is created by Sizzle McTwizzle and has a lot of scripts in its inventory.

• A lot of scripts
• Features like script sync from Github, fork scripts, ...
• Open source development