Free Pascal

Free Pascal Compiler (FPC for short, and formerly known as FPK Pascal) is a free Pascal and Object Pascal compiler.

In addition to its own Object Pascal dialect, Free Pascal supports, to varying degrees, the dialects of several other compilers, including those of Turbo Pascal, Delphi, and some historical Macintosh compilers. The dialect is selected on a per-unit (module) basis, and more than one dialect can be used to produce a single program.

A member of the write once, compile anywhere campaign, Free Pascal is available for many architectures and operating systems (see Targets). 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.

Read more about Free Pascal:  Supported Dialects, The 2.4.x Release Series, The 2.6.x Release Series, Trunk (2.7.x), Targets, Integrated Development Environments (IDEs), Software Produced With Free Pascal

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    The consciousness of the falsity of present pleasures, and the ignorance of the vanity of absent pleasures, cause inconstancy.
    —Blaise Pascal (1623–1662)