.NET is a free, cross-platform, open source development platform.
Android is a mobile operating system designed primarily for touchscreen mobile devices.
Java is a programming language and computing platform first released in 1995.
Mono is an open-source development platform based on the .NET Framework.
iOS is an operating system developed by Apple that powers many of the company’s mobile devices.
iPadOS is Apple's operating system for iPad tablet devices.
macOS is the operating system that runs Apple's Mac range of laptop and desktop computers.
tvOS is a dedicated platform for Apple TV that is heavily inspired by iOS.