Mono

Supports building .NET applications on Linux, macOS, and Windows using the Mono framework, providing a comprehensive development environment as highlighted in the key features.

Built with a core and add-in system allowing for additional functionality through extensions, enabling customization and expansion per the extensible architecture feature.

Includes debugging capabilities compatible with Visual Studio on Windows or macOS, facilitating seamless debugging across platforms as stated in the integrated debugging feature.

Uses Gtk# for its user interface, offering a native look and feel on supported platforms like Linux, ensuring consistency in desktop applications.