Zeal is not available for Mac but there are some alternatives that runs on macOS with similar functionality. The best Mac alternative is Dash for macOS. It's not free, so if you're looking for a free alternative, you could try Zest or dasht. If that doesn't suit you, our users have ranked more than 10 alternatives to Zeal and five of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to Zeal are Rust Search Extension and PHP Function Index.
Dash is an API Documentation Browser and Code Snippet Manager. Dash stores snippets of code and instantly searches offline documentation sets for almost any API you might use. You can even generate your own docsets or request docsets to be included.
easy to deploy, has vim plugin
A handy browser extension to search Rust docs and crates, etc in the address bar instantly!
The PHP Function Index (PHPfi) is a very fast documentation viewer to look up any PHP function.
Romania
EU
They are basically twins, since both find documentation by pressing on a keyboard shortcut.