Free Pascal Compiler (FPC) is a compiler for the closely related programming language dialects, Pascal and Object Pascal. It is free software released under the GNU General Public License.
License: Open Source
Delphi is a powerful, commercial IDE with strong support for GUI applications and a rich set of libraries, but it comes with high licensing costs. Free Pascal, on the other hand, is a robust open-source alternative that offers cross-platform capabilities and a strong community but lacks some of the advanced features and support that Delphi provides.