ttmsg uses many great open source libraries:

• SwiftEventBus, a publish/subscribe EventBus optimized for iOS.
• EZSwiftExtensions, how Swift standard types and classes were supposed to work.
• Pantry, the missing light persistence layer for Swift.
• IQKeyboardManagerSwift, codeless drop-in universal library allows to prevent issues of keyboard sliding up and cover UITextField/UITextView. Neither need to write any code nor any setup required and much more.
• JVFloatLabeledTextField, UITextField subclass with floating labels - inspired by Matt D. Smith's design.
• Neon, a powerful Swift programmatic UI layout framework.
• source-code-pro, monospaced font family for user interface and coding environments.
• Realm, mobile database.
• CocoaMQTT, MQTT for iOS and OS X written with Swift.
• SwiftyStoreKit, lightweight In App Purchases Swift framework for iOS 8.0+, tvOS 9.0+ and macOS 10.10+.
• Siren, notify users when a new version of your app is available and prompt them to upgrade.
• Eureka, elegant iOS form builder in Swift.
• SCrypto, elegant Swift interface to access the CommonCrypto routines.
• Fusuma, instagram-like photo browser and a camera feature with a few line of code in Swift.
• Whisper, a component that will make the task of display messages and in-app notifications simple. It has three different views inside.
• TouchVisualizer, Lightweight touch visualization library in Swift. A single line of code and visualize your touches.