ORSSerialPort
Serial port library for Objective-C and Swift macOS apps
..., meaning you're free to use it in both closed and open-source projects. However, even in a closed-source project, you must include a publicly-accessible copy of ORSSerialPort's copyright notice, which you can find in the LICENSE file. There are a number of ways to add ORSSerialPort to your project. You can use the included framework project, Carthage, CocoaPods, or the Swift Package Manager. See the Guide to Installing ORSSerialPort for detailed instructions for each of these methods.