Dash 7 Released
Dash, a documentation viewer for macOS, just released version 7. I've been using Dash for at least nine years, and can't imagine why anyone wouldn't. What Dash does is let you have all of your documentation offline and with full text search. If you're familiar with the Xcode documentation window, it's like a better version of that, which also works for man pages, languages, web frameworks, whatever.
This version switches from a once a year upgrade to a $15 a year subscription, which seems insanely cheap for the value you're getting. If you're not already a user, you should go try it now.