Do you miss the days of Visual C++ 6 when you had the entire MSDN documentation offline for access? Dash is a Mac app that does that for a whole bunch of languages and libraries. And if you are on Linux, Zeal is a clone of Dash that does the same.
To install Zeal:
$ sudo add-apt-repository ppa:zeal-developers/ppa $ sudo apt-get update $ sudo apt install zeal
At installation, Zeal has no documentation, called docsets, for any language or library. Go to Options and download the docsets for whatever you use regularly.
Once the docsets are installed you can query any word by typing it in the top-left box directly. If you want to query in a specific docset, C++ for example, use the prefix
Zeal puts a system tray icon by default. But, it appears in the top-left corner of my display instead. This overlaps with the close button of windows, which is irritating. So, I disable the system tray icon by going to File -> Options and disabling Show system tray icon.
The icing on the cake is that you can now query any word in Vim and view its documentation directly in Zeal. I do this by adding this line to my vimrc:
nnoremap <Leader>z :!zeal --query "<cword>"&<CR><CR>
\z on any word in Vim and bingo, I have the documentation for it in Zeal!
Tried with: Zeal 0.1.1 and Ubuntu 14.04