Kite

Documentation - and efficient documentation at that - is without a doubt of the utmost importance when coding. Unfortunately, it may very well be one of the most time-consuming and rhythm-destroying operations since it requires you to pull away from your code editor in order to search for help on the web.
If you're aiming to enhance your productivity while coding, then read on, as you'll definitely find the following tool to be nothing less than ingenious.

Smart coding assistant that only comes with support for Python IDEs

Kite is a complex piece of software that smoothly integrates with some of the most popular Python code editors (Atom, Sublime Text 3, PyCharm, and Visual Studio Code) in order to feed you an impressive amount of relevant data (completions, examples and dozens of useful online documents) without requiring you to use Google.
Yes, we know what you're going to say, it's a shame that it's only good for Python, but rest assured, support for multiple languages is currently in the works, so we should see a Kite app that will also be good for Java, Go, JavaScript, C# for starters, and possibly even for Swift, PHP, Ruby, and C/C++.

A few words on how to install and configure Kite

So, to get started, you are required to undergo a fairly straightforward installation and configuration process, even though, it does require a fair bit of attention on your part. Subsequent to a typical deployment process, you are greeted by a generic Get-Started screen. You're basically required to whitelist the directories which will be used by Kite to enable Cloud Sync and to enable the tray icon.
From this point onwards, you need to install the plugins for the appropriate Python code editor. From the taskbar menu, select Settings, and head over to the Plugins section and install plugin associated with your code editor. From now, you should be able to see Kite's integration with the aforementioned code editors, usually in the lower right corner of the main window (both Atom and PyCharm's case). If any problems arise, feel free to check out the app's thoroughly-organized support documentation page for further help. http://help.kite.com/

Instant Python-related info, always at the tips of your fingers

This brings us to the app's not-exactly-revolutionary (as a concept), but definitely ingenious completion engine. Ranked completions, popular patterns, examples, and useful docs, are the key words here. Basically, Kite provides you with the most relevant information based on how popular the specific search is on the web.
And that's not all. If you feel like you need even more info on various functions or arguments, let's say, simply click the "MORE" button located at the button of the pop-up completion window, and you're instantly provided with the data at hand, directly to your computer's web browser.
You can also get on-the-fly information on practically any object or identifier, by hovering it with the cursor. Unfortunately, the so-called Kite Sidebar is only available for the macOS version, which is quite a shame, since the tool in question definitely has the potential to improve the user experience by complementing the "standard" completions.

Currently a must have only for Python programmers, this tool might very well become the norm for other languages, as well

All in all, it's safe to say that Kite is an uber-useful and well-sorted programming tool that brings everything you might need (examples, ranked and sorted completions, and useful docs) closer to you, in order to code as efficiently and as easily as possible.
It will certainly be interesting to see how this project will evolve in the following period since, we're sure you'll agree, this is a seriously capable tool, even as it stands. With the addition of support for various other programming languages, and if the overall quality remains the same, there's a great chance that  Kite will soon become the norm for most programmers out there.