Free Pascal Compiler (FPC, formerly named FPK Pascal, for program author Florian Paul Klämpfl, the name changed at the end of 1997) 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. It follows a write once, compile anywhere philosophy, and is available for many CPU architectures and operating systems (see ). It supports integrated assembly language and an internal assembler in several dialects.