Extension Maker and Library Maker for Game Maker 7 and later.

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Extension Maker

Version 1.2
Written by Mark Overmars

Introduction

Game Maker has a large number of features but there is always a need for more. Since version 7.0 it is possible to add extension packages to Game Maker. Extension packages extend the functionality of the GML language by adding additional action libraries, functions and/or constants. They can be created relatively easy by people that have a bit of programming experience.
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Library Maker

Version 1.3
Written by Mark Overmars

Introduction

The collections of actions that you find in the object properties form and that can be used in events are stored in libraries. There are a number of default libraries but you can also create your own libraries. Such libraries can then be turned into extension packages using the Extension Maker. The Extension Maker generated package files which can then be installed and used in Game Maker. For details see the help file of the Extension Maker.
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Download Extension Maker and Library Maker for Game Maker 7 and later.