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Mops is a full featured, stand-alone development environment for programming the Macintosh written by Mike Hore. Inspired by Smalltalk and the commercial language Neon, Mops is based on Forth with extended object-oriented features such as multiple inheritance, early and late binding, persistent objects, and garbage collection. Its interactive development environment provides for fluid and productive programming by allowing quick testing and modification of small code segments.

Mops comes with a large class library supporting many Smalltalk-like classes such as containers and all of the normal Mac graphical user interface elements. There is seamless integration of Macintosh Toolbox calls. AltiVec and external frameworks such as OpenGL and Mach-O are also supported. Included is the complete source code and a well-written manual, which is useful for the novice or expert.

Mops is Carbon-compliant and runs under Mac OS 9.x and all Mac OS X versions released to date. It is a subroutine threaded, optimizing Forth compiler (transparent to the programmer) resulting in programs that run very quickly. Over seventeen years since its inception, the program is still actively maintained by the original author along with a corps of dedicated volunteers.

As an offspring of PowerMops, iMops is an X86-64 native implementation of Mops language for Mac OS X. It is also a subroutine threaded, optimizing Forth compiler and linked with Cocoa/Objective-C.

Even if you never thought you had a reason to try something different, Mops might be just what you are looking for!


iMops 2.21 released -- Interruption into "Echo during Load" by Space key was made possible. Some bugs were fixed Download Page
iMops 2.2 released -- A maintenance release but now iMops is a developer-signed application. Download Page
iMops 2.11 released -- A maintenance release. Few bugs were fixed. Details are in a file "What's new". Download Page
iMops 2.1 released -- some bugs have been fixed and new STRING+ class source file included. Download Page
iMops 2.01 released -- a bug was fixed and object cascading feature was added. Download Page
PowerMops wiki restored after SourceForge hosted app shutdown.
iMops 2.0 released -- many bugs fixed and French language resource is included (thanks to Gérard Castagné).
PowerMops 6.2 has been released -- a few bugs fixed, and a new mechanism for creating arrays and lists of objects.
Updated from a unique MediaWiki instance to the SourceForge hosted app.
PowerMops 6.1 has been released! Dozens of bug fixes.
PowerMops 6.0 has been released. Check out the latest release notes in the Open Me First document or go directly to the download page to fetch your complete copy.