High Resolution Timer by Yourself

This extension allows you to measure time much more accurately than Game Maker can on its own. Normally, Game Maker can only measure times accurate to about 16 ms, but with this extension you can measure times accurate to smaller than one µs (microsecond; there are 1000000 microseconds in one second). Read the included documentation for more information.

GRegex Regular Expressions Exten... by Yourself

This extension allows you to use powerful regular expressions in your game. But, what are regular expressions? A regular expression allows you to search a string for all sorts of different patterns in a string with minimal effort. Where Game Maker restricts you to searching for specific strings (like "dog") a regular expression would allow you to search for almost anything you can imagine. It can be used to verify that user input is valid or to help parse your very own scripting language.

Data Sorting Extension by Yourself

Game Maker does provide a fast way to sort data in list data structures, but this extension provides a much more flexible way to sort data in both arrays and lists. This can come in handy if you have a list that contains many instance IDs and you want to sort them by depth, or x coordinate, or any other property. The data can be sorted according to any criteria you wish and it's as easy as adding a single script. See the included documentation for more.

Advanced Gesture Recognition Sys... by Kyle_Solo

Ever played Black and White? If so, you must remember the innovative spell system, which required you to trace a spell's symbol to cast it. My gesture system allows just that. With just a few lines of code, you can add shape recognition to your games. It will take you no more than a few minutes to master the system, which contains only 13 scripts, and 6 of those are optional extra features. The help file also has an easy to follow step-by-step tutorial that will guide you through the process of recognizing a shape.

For more info, check out the GMC topic:
http://gmc.yoyogames.com/index.php?showtopic=294978

Current Version: 5.0

3d drag and drop functions by Biogamer

this has six basic 3d drag and drop functions the camera one doesn't work though

JG Action Library by Sunstroke

A simple action Library.

However, it will steadily get more and more commands as I take requests.

Sprite Generator - Top-down Tank... by Lord Sandro

This easy-to-use extension generates tank sprites. It's based on the code developed for World Domination and it will be featured in further versions of it. Since this is a new extension it doesn't yet support all the features that will be available in World Domination.

GOTO: www.lordsandro.com\tankgenerator.htm to learn how to use the extension.

GiiMote by leif902

GiiMote is an extension for Game Maker 7 and above that can be used to add Wii Remote support to your Games.

Current Version: 2.0

Extension by witte

New great funny things to fx draw the highscore in acions!!

Hex Scripts by leif902

This extension allows you to write and read integer words of any length on an open file stream. It also supports radix-radix conversion and relative seeking in a file stream.

Defines constants for many different numeral bases and data lengths, etc.

More Information:
http://scripts.greenmangames.vze.com/
http://gmlscripts.com/script/file_functions