Stripe iOS SDK - Accept both Apple Pay and credit card payments easily on iOS
Radar - Radar - Location sharing for friends and teams.
MightySignal Top SDKs - Most used SDKs in top 200 free iOS apps. Learn what to use.
HyperTrack - Build logistics apps that feel like the future
LocationAPI - Instantly locate any device w/ WiFi, celltowers & IP address
Indoor Location - SDK for indoor location as a service with Estimote Beacons