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
Ultimate++ is a cross-platform C++ framework that focuses on performance and lightweight applications, while SharpDevelop is a Windows-only IDE primarily for .NET languages, providing a more user-friendly interface and rich debugging features.