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iOS
- Cocoa Dev Central
- iOS 8 App Development Essentials
- iOS Succinctly, Syncfusion (PDF, Kindle) (email address requested, not required)
- Mastering iOS Game Development – Miguel DeQuadros, Packt (email address requested, not required)
- NSHipster (Resource)
- Start Developing iOS Apps (Swift) (HTML)
- Start Developing iOS Apps Today (Objective-C) – Last updated 22.10.2013 (PDF)
IoT
- IoT in five days- V1.1 (PDF, EPUB)