From Lazarus-ccr

Turbo Pascal is a dialect of the Pascal programming language which was sold by Borland International during the 1980s and 1990s for use with the MS-DOS and later Microsoft Windows operating systems. It provided an Integrated Development Environment or IDE, which combined editor, program compiler and execution environment for developing, debugging, and compiling Pascal source code.

It would later provide features such as conditional compilation and the ability to separately compile modules using the unit directive, and would also implement some of the features which were first implemented years earlier in UCSD Pascal.

Turbo Pascal would eventually be renamed Borland Pascal, and later phased out, to be replaced by a more powerful Pascal Compiler, Delphi, for use on the Microsoft Windows (and the Kylix version for use on the Linux) operating system.

The FPC Pascal Compiler provides a high level of compatibility with code written for Turbo Pascal and Borland Pascal, and some degree of compatibility with code written for Delphi and Kylix.

Various Pascal Compilers:

AAEC Pascal - Alice Pascal - Borland Pascal - Delphi - FPC - GNU Pascal - Kylix - NBS Pascal - OMSI Pascal - P32 - Swedish Pascal - Turbo Pascal - UCSD Pascal - VAX Pascal

An extensive list of compilers is maintained at Pascaland.