Pascal

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Pascal is a classical procedural programming language that facilitates structured programming. It advantages include english-like elegant source code style, a plethora of data types and a broad basis of implementations on both virtual and physical machines. Most modern Pascal compilers implement ObjectPascal, an extension for object-oriented programming that has first been proposed by Apple and that was later augmented by Borland.

There are numerous Pascal dialects for embedded systems:

Overview of Pascal compilers for embedded systems
Compiler Company License Development platform Target platform Comments
Free Pascal Free Pascal team GPL, LGPL Linux, Mac OS X, Win32 ARM systems including Raspberry Pi Mature, stable version
Free Pascal Free Pascal team GPL, LGPL Linux, Mac OS X, Win32 Atmel AVR Experimental
Lazarus Lazarus team GPL, LGPL Linux, Mac OS X, Win32 ARM systems including Raspberry Pi GUI-based IDE for Free Pascal
Pascal-scm E-LAB Computers proprietary Win32 Atmel AVR Demo version available, standard version for ATMega8/88 free
MikroPascal for AVR Mikroelektronika proprietary Win32 Atmel AVR 2K Demo version available
PasAVR Vogelaar Electronics proprietary Win32 DelphiStamp Cross-Compiler for Object Pascal