Tampermonkey adds userscript support to Safari, and is updated on a regular basis. It provides features like easy script installation, automatic update checks, an overview of what scripts are running in a tab, and many more.
What's New
Safari:
- Fix issues with scripts containing non-ASCII characters and High Sierra | thanks to Zord123
General:
- Fix homepage icons linking to the same URL after a script was closed
- Avoid issues with very long script version strings
- Fix GM.openInTab setParent option
- Make userscripts appear at developer tools
More...
Requirements
- OS X 10.5 or later
- Safari 5 or later
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