Interactive; thoroughly customizable maps in native Android; iOS; macOS; Node.js; and Qt applications; powered by vector tiles and OpenGL

Source: mapbox/mapbox-gl-native

Open source map library for iOS

Source: route-me/route-me

The Swift Geographic Engine.

Source: andreacremaschi/GEOSwift

Allows you to use custom maps in iphone applications and attempts to mimics some of the behaviour of the MapKit framework

Source: neilang/NAMapKit

CMMapLauncher is a mini-library for iOS that makes it quick and easy to show directions in various mapping applications.

Source: citymapper/CMMapLauncher

Google Directions API helper for iOS; written in Swift

Source: poulpix/PXGoogleDirections