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Free Pascal Compiler (FPC for short) is a free and open-source Pascal and Object Pascal compiler.
Free Pascal fully or partially supports the dialects of many other Pascal compilers, including those of Turbo Pascal (up to version 7), Delphi, as well as some compilers that were available on the Macintosh. More than one dialect may be used to produce a single program. Free Pascal also supports the ISO/IEC 7185 Pascal standard.
A member of the write once, compile anywhere campaign, Free Pascal is available on many architectures and operating systems. It has an excellent support for integration of assembly language, and supports internal assembler in a number of dialects.
Separate projects exist to facilitate the development of cross-platform graphical applications, the most prominent one being the Lazarus IDE.