Zeal: Offline Documentation Browser

Zeal is a great tool for browsing documentation without the need for an internet connection.
As a great addition I can recommend zealusercontributions: https://zealusercontributions.now.sh
I love how fast it feels to browse the documentation, instead of wasting seconds after seconds waiting for some overloaded website to load.
I think the unfree MacOS tool Dash was there before, they also provide the docsets.
Zeal reminds me of the good old .chm file format: Microsoft Compiled HTML Help

1. How to search
- string will search all docsets for string
- python:string will search only docsets related to Python for string
See more useful tips here: https://zealdocs.org/usage.html
2. My favorite docsets
2.1. Official
- Android
- Ansible
- Arduino
- Bash
- C++
- CSS
- Docker
- Flask
- Go
- Gulp
- Haskell
- HTML
- Java EE8
- Java SE14
- JavaScript
- Jekyll
- Kotlin
- Markdown
- MongoDB
- Nginx
- NodeJS
- Python 3
- Rust
- Scala
- Spring Framework
- SQLite
- SVG
- TypeScript
- Vagrant
- Vim
- VueJS