I came across Zeal some time ago, and for some reason never really got to using it. Mainly because I’m always online and always have access to reference sources. Also, I find myself with a lesser need for documentation as the product base I deal with shrinks.
Then I find I get asked to get stuck in at the coal face and bring out my old Laravel, PHP and JavaScript skills, to bring more hands to a development project. Out comes VSCode and a bag of helpful plugins, and I rediscover zeal.
Install Zeal onto my desktop. Add a few document sets that I need - Laravel, PHP and JavaScript. Then use the Dash VSCode plugin (It supports Dash - MacOS, Zeal - Linux and Velocity - Windows).
Then a simple CTRL+H in VSCode links me to the Zeal documentation search.