See the license files in the respective folders, all are under permissive open source licenses.
I am Robert Joshua Allen, Chief Marketing Officer at Droid Mobile.
Droid Mobile is a mobile first software consultancy that develops and advises on mobile apps and games. We develop native Android apps in Kotlin and Java, native iOS apps in Swift, and update legacy iOS apps in Objective C. We build multi platform mobile apps in Xamarin or Flutter, desktop apps in .NET or Flutter, and web apps in Angular or Flutter.