This package provides the following services:
Autocomplete for Swift

Provides completion for Swift using sourcekitten and Swift Package Manager.
How to use
Install using APM (or through atom's UI)
apm install swiftkit
Install sourcekitten
brew install sourcekitten
Build your project
swift build
Limitations
Currently sourcekitten only has support for macOS, support for Linux is on its way
Currently only has support for project's with a SwiftPM generated build file. This mean's there is no completion for app development.
Goals
Prior works
All possible thanks to SourceKitten Facebook's nuclide provided the initial groundwork with this.