BLE (Bluetooth LE) for U🎁 Bleu is the best in the Bluetooth library.
iOS Bluetooth LE framework
iOS app for use with Bluefruit Bluetooth LE modules and dev boards from Adafruit (v2.0)
A simple Swift framework for building reliable Bluetooth LE apps.
A Bluetooth Low Energy browser, an open-source alternative to LightBlue for OS X
Easily communicate between iOS/OSX devices using BLE
iOS & OSX Bluetooth library for RxSwift
Closures based APIs for CoreBluetooth