SharpDevelop (#develop) is a free and open source integrated development environment (IDE) for the .NET Framework, Mono, Gtk#, Glade# platforms. Developed by IC#Code
License: Open Source
RAD Studio is a robust IDE primarily aimed at professional developers, offering extensive tools for cross-platform development and mobile applications, but comes at a cost. SharpDevelop, on the other hand, is an open-source IDE that is more lightweight and suitable for .NET applications, making it ideal for beginners or small projects.