Compilers

Alice Pascal
A syntax directed editor, interpreter and IDE for Pascal. Free source code (linux) plus binaries for IBM PC and Atari ST.
http://www.templetons.com/brad/alice.html

Canterbury Pascal
Compiles Pascal programs directly into Java byte code. Also translates Pascal source into Java.
http://www.mhccorp.com/pasjava.shtml

Framework Pascal
32-bit Pascal compilers for DOS, OS/2, and Windows 9x/NT. Multi-target edition allows you to compile to any platform. Commercial software, but limited demo edition is available for download.
http://www.frameworkpascal.com/

Free Pascal Compilers
List of free Pascal compilers and development environments with useful descriptions.
http://www.thefreecountry.com/compilers/pascal.shtml

HP OpenVMS Pascal
Was DEC Pascal, then Compaq Pascal, optimizing compiler runs on VAX and Alpha CPUs, OpenVMS and Tru64 Unix OSs, meets Federal Information Processing Standard Publications standard FIPS-109. Descriptions, documents, news, support.
http://h71000.www7.hp.com/commercial/pascal/pascal_index.html

Irie Pascal
A compiler that generates portable byte-code executables from Pascal source files, and an interpreter that runs the byte-code executables at Windows, Linux, FreeBSD, Solaris/x86, and Solaris/Sparc. The Windows Edition includes an Integrated Development Environment (IDE).
http://www.irietools.com/

Nemesis Pascal
A Pascal interpreter. It's Delphi/Kylix compatible. Nemesis Pascal uses internally a modified version of the JEDI Pascal Interpreter. It's cross-platform (currently Windows and Linux) and includes Virtual Machine, IDE (RAD), Web Scripting Tool. [Open source, GPL and MPL]
http://npascal.sourceforge.net

P4 Pascal Implementation
Complete implementation of the P4 Pascal compiler and interpreter. Source for the compiler is available in C and Pascal.
http://homepages.cwi.nl/~steven/pascal/

Pascal Compiler for the 8051 Microcontroller
Cross compiler for the Intel 8051/8052 microcontroller. Accepts standard Pascal code and avoids having to program in assembly. Freeware.
http://www.geocities.com/SiliconValley/Campus/9592/

Pascal Pro compiler page
A free, open source, 32-bit Pascal compiler that produces assembly code for the 386 and above chips.
http://www.fortunecity.com/skyscraper/sql/39/

Pascal-scm for Atmel AVR
E-LAB Embedded Pascal for Atmel AVR micro-controller.
http://www.elab-pascal.de/AVRco/index_en.html

Prospero Extended Pascal
Windows 9x/NT Pascal compiler implementing the Extended Pascal language. Includes IDE, debugger, make utilities, and documentation.
http://www.prosperosoftware.com/e32iw.html