KDevelop is a free and open-source integrated development environment (IDE) for Unix-like computer operating systems and Microsoft Windows.
License: Open Source
Delphi is a powerful IDE primarily used for Windows application development with a strong emphasis on rapid application development and database connectivity. In contrast, KDevelop is an open-source IDE that excels in C/C++ development and offers cross-platform capabilities, but lacks some of the visual design tools found in Delphi.