autocomplete+ package 
View and insert possible completions in the editor while typing
Please note: In the example above I have "Enable Auto Activation" enabled.
Installation
You can install autocomplete+ using the Preferences pane.
Plugins
Also grab one of these awesome additions for autocomplete+:
Usage
Just type some stuff, autocomplete+ will automatically show you some suggestions.
Press UP and DOWN to select another suggestion, press TAB to confirm your selection.
Additional confirmation keymapping can be customised in your keymap.cson:
".autocomplete-plus input.hidden-input":"enter": "autocomplete-plus:confirm"
Features
- Shows autocompletion suggestions while typing
- Two modes: Live and delayed autocompletion (instant might slow down performance)
- Wordlist generation happens initially and on save (saves performance)
- Suggestions are calculated using
fuzzaldrin(better results) - File blacklisting
- Automatic wordlist expansion while typing
Geeky Stuff: Adding Suggestion Providers
Since version 0.12.0, other packages are able to register suggestion providers to the autocomplete-plus package.
See the tutorial on how to create and register suggestion providers