Lazarus Component Library and IDE for FreePascal

Lazarus is a free and open source RAD (Rapid Application Development)
tool for FreePascal using the Lazarus Component Library (LCL).
It provides a Delphi-compatible IDE with a visual form designer,
code editor with syntax highlighting and code completion,
integrated debugger, and a large component library.
Cross-platform: creates native applications for Linux, Windows, and macOS.