Zeal's great; so wonderful to have access to all these docs offline. Now (June 2020) there's still a bug with the JS docs, which is scheduled to be fixed in the next release. In the meantime, there's an easy fix: https://github.com/zealdocs/zeal/issues/1155#issuecomment-553213420
The best documentation browser I have ever seen. It has got everything all at one place.