A 2D game engine that doesn't need coding/programming but has scripting support for those that know how to program. While initially designed for 2D RPG games the engine has been improved to allow developers to create virtually any kind of 2D game as well as  possible 3D support in future.
*Note: The free (community) version will have less features than their subscription based version. "Create your game on virtually any platform. Whether it be on desktop or mobile devices, 001 can port your game for users to enjoy on multiple types of platforms, whether it be an iPhone or PC device."(from site)

"Create complex 3D worlds in a matter of a few minutes. Preview your automated worlds. See your creations come to life. A rich 3D library of 3D models is included. The Editor user interface is built from four views similar to 3D Studio max user interface. The application contains many advanced tools for quick and easy 3D modeling. Suitable for creating large environments and for creation of small models."(from site)
*Note:
1.There are 3 versions of this product. Student(Not free), Non-commercial(Free) and Commercial Version.
2. The Student version(20MB) and Commercial version(20MB) have the same features, but student version cannot be used commercially.
3. The Free version (10MB)has the least number of features, can't be used for commercial applications, has a 20 second nag screen and must be registered to obtain a free serial key which will be sent to your email account.

"Create interactive 3D worlds and games by visually placing objects in virtual space with this user-friendly 3D editor with a straightforward developing workflow and ready-to-use physics simulation.

You can use it to create any sort of stand-alone, interactive 3D project for Windows Vista/XP. Ideal for CG artists and non-coders, but flexible enough to meet the needs of expert developers as well."
(from site)
If you are a coder then you can try out their other site 3impact.com for their SDK.

"Even if you can't program, you can design fantastic worlds using nothing but your mouse.
The 3DSTATE WorldBuilder  is currently used by more than 70,000 people.
The product has received the highest rating in every review including leading brands such as Tucows and CNet.Whether games, tourism, education, or else - no matter what your project is s about, using the 3DSTATE  WorldBuilder editor  you will get top quality results within extremely short time." (from site)
Note:
1. Requires mandatory registration to obtain free serial key.
2. Both 3D editor(10MB above) and 3D world builder are very similar applications with a few differences.
3. For programmers 3D State also have 3D Developer  Studio: A Software Development Kit (SDK) that supports Visual C#, Microsoft Visual C++, Borland C++ Builder, Microsoft Visual Basic, Borland Delphi and Euphoria, free for non-commercial use.

This game maker is designed to create click and play games similar to Gabriel Knight. Adventure Game Studio allows you to create your own point-and-click adventure games, similar to the early 90's Sierra and Lucasarts adventures. It consists of an easy-to-use editor to create your games, and a run-time engine to play them. (from site)
If you don't know what adventures games are try these well known ones: 5 DAYS A STRANGER and 7 DAYS A SKEPTIC both created with Adventure Game Studio (AGS)

"Alice is an innovative 3D programming environment that makes it easy to create an animation for telling a story, playing an interactive game, or a video to share on the web. Alice is a freely available teaching tool designed to be a student's first exposure to object-oriented programming. It allows students to learn fundamental programming concepts in the context of creating animated movies and simple video games. In Alice, 3-D objects (e.g., people, animals, and vehicles) populate a virtual world and students create a program to animate the objects.

In Alice's interactive interface, students drag and drop graphic tiles to create a program, where the instructions correspond to standard statements in a production oriented programming language, such as Java, C++, and C#. Alice allows students to immediately see how their animation programs run, enabling them to easily understand the relationship between the programming statements and the behavior of objects in their animation. By manipulating the objects in their virtual world, students gain experience with all the programming constructs typically taught in an introductory programming course."(From site)
This product includes software developed by Carnegie Mellon University.

"(Mainly for 2D games)The Allegro library provides C/C++ programmers low level routines commonly needed in game programing, such as
input, graphics, midi, sound effects, and timing. It is cross platform and works with many different compilers.
Originally developed by Shawn Hargreaves, it is now a group project with contributions from all over the world!
Some of its key features include:

• Ease of Use - comes with comprehensive documentation and examples
• Extensibility - if the built-in functionality isn't enough, there are many add-ons available
• Cross Platform - without changing a single line of code, you can create versions for Windows, OS X, Linux, DOS, and others! Works with many compilers, including DJGPP and VC++
• Open Source - anyone can contribute, including you!
• Free - it won't cost you a dime, and there are no restrictions on its usage" (from site)

Allegro.cc is the most comprehensive website on the Internet pertaining to the Allegro Gaming Library.

The Cafu Engine is an all-purpose, modern 3D graphics engine and game development kit, feature complete to get you started quickly.

Cafu is available to everyone as 100% free software under the GNU General Public License (GPLv3). It can be used to create a variety of 3D applications, including games, simulations, and training and architectural software. Written in C++, the tools, libraries and framework have been designed to make the development of new games and other 3D applications easy. They are actively and continuously developed in order to provide the latest technology.(from site)

"Construct Classic is a free, DirectX 9 game creator for Windows, designed for 2D games. It is the predecessor to the more modern Construct 2. Construct Classic uses an event based system for defining how the game behaves, in a visual, human-readable way - you don't need to program or script anything at all. It's intuitive for beginners, but powerful enough for advanced users to work without hindrance."(from site) Also supports Python scripting.


Note: Construct Classic is no longer being improved by Scirra ( the developer) who has created an newer version called Construct 2 (commercial program)

"CopperCube is a 3D engine / editor with deployment targets for Flash (.swf), WebGL/JavaScript (.html), Windows (.exe) and Mac OS X (.app).

You can create simple interactive 3D scenes without the need to write one single line of code (=no programming necessary), or even create whole games with the help of a little bit of scripting magic. You can script and access everything in the engine using ActionScript 3 or JavaScript. " (From Site)
 Feature List of CopperCube

"CraftStudio is a multiplayer platform to create games and interactive movies.It's very easy to use and it feels just like playing. You will be making awesome stuff in no time!"(from site)
This program  allows you to create worlds very similar to the look and feel of games such as minecraft.
Note:
This program is still in early development and is free while still in pre-alpha stage.

2D game engine that allows game designers to make their own games using an easy to use graphical interface. Requires some knowledge of game programming to use effectively. The Free version can make games that can be exported to HTML5 (playable in you web browser), Apple iPad as well and windows standalone format (*.exe)
*Note:The free version has a watermark on all games created, plus 10 object limit and 3 Scenes limit.
Dark Flow Pro doesn't have these limitations and supports more platforms (eg Nintendo Wii, Nintendo Ds, Sony PSP and Apple iPhone)

Commercial program to create 3D games without programming. Free version with limited features available. Created games can work on Macintosh, Windows and Android.

DX Studio is a complete integrated development environment for creating interactive 3D graphics. The system comprises of both a real-time 3D engine and a suite of editing tools.  Using DX Studio you can build complete real-time interactive applications, simulations or games, for standalone use or for embedding in other Microsoft Office/Visual Studio applications. (from site)

*Free Commercial Pro License The full DX Studio Commercial Pro edition is now free but requires registration to activate. To get your license key, please first give us (Worldweaver) a Like on Facebook and/or a Follow on Twitter. If you are not on either, we may be able to accept another social network. Please post in the New Users forum and we will PM if approved. (also from site)

"Ethanon Engine is a free 2D game development tool focused on the recent video cards for hardware acceleration and shader effects. It may be used to develop any style of game, such as top-down view RPG's, side scrollers and shoot'em up games. The main goal of this engine is to provide high-quality lighting, shadow and particle effects with an easy to use visual interface and a simple and direct scripting system. To control the game flow and handle its events, Ethanon Engine uses AngelScript for scripts, which brings a familiar C++ syntax to the code. The integration with the scripting language is pretty simple and easy to understand. Many features are included in the scripting system, such as full entity manipulation, save and load games with one instruction, video playback support, and more." (from site)

Euphoria is a simple, flexible, and easy-to-learn programming language. It lets you quickly and easily develop programs for Windows, DOS, Linux and FreeBSD. Euphoria was first released in 1993. Since then Rapid Deployment Software has been steadily improving it with the help of a growing number of enthusiastic users. Although Euphoria provides subscript checking, uninitialized variable checking and numerous other run-time checks, it is extremely fast. People use it to develop Windows GUI programs, high-speed DOS games, and Linux/FreeBSD X Windows programs. It is also very useful for CGI (Web-based) programming. (from site)

HGE is an easy to use yet powerful hardware accelerated 2D game engine. It is a full featured middleware for all who want to develop commercial quality 2D games rapidly and easily. It covers all imaginable 2D game genres: you coul