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Language & Frameworks
Objective-C, Swift, C#, JavaScript, Cocoa/Cocoa Touch, OpenGL ES, Cocos2d, and Unity3D
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Libraries
StoreKit, PushKit, CallKit, RestKit, Alamofire, RxSwift, Swift 01, Core Data, REALM, Firebase, ShareKit, ARKit, Socket Client, Sinch, and QuickBox
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APIs
Urban Airship, Universal Analytics, Twilio, Wikitude, RedLaser API, Google APIs, payment systems (PayPal, Datatrans, Razorpay, Stripe, Fiserv, etc.), and Social networking APIs