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* [CGTextures](http://www.textures.com) - A large collection of textures. 🚩
* [GameDev Market](https://www.gamedevmarket.net/) - a community-driven marketplace that connects indie game developers with talented asset creators. 💲
* [OpenGameArt](http://opengameart.org/) - a media repository intended for use with free software game projects. 🆓
* [PlainTextures](http://www.plaintextures.com/) - Free high resolution textures, brushes and photos 🆓
* [Sketchfab](https://sketchfab.com/) - Publish & embed interactive 3D models. 🚩
* [Upando](http://upan.do/) - Marketplace with lots of resources for game developers. 🚩
* [Vecteezy](http://www.vecteezy.com/) - Free Vector Art. 🆓
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* [Agen](http://2dengine.com/page.php?p=features) - Cross-Platform framework for making 2D games with Lua, compatible iOS, Mac and Windows devices.
* [Allegro](http://liballeg.org/) - Allegro 4 & 5 are cross-platform, open source, game programming libraries, primarily for C and C++ developers. 🅾️
* [AndEngine](http://www.andengine.org) - 2D Android Game Engine 🅾️
* [Bacon2D](http://bacon2d.com/) - A framework to ease 2D game development, providing ready-to-use QML elements representing basic game entities needed by most of games. 🅾️
* [Bladecoder](https://github.com/bladecoder/bladecoder-adventure-engine) - Classic point and click adventure game engine and editor. 🅾️
* [Box2D](http://box2d.org/) - A 2D Physics Engine for Games. 🅾️
* [Chipmunk C#](https://github.com/netonjm/ChipmunkSharp) - C# implementation of the Chipmunk2D lib. 🅾️
* [Chipmunk2D](https://chipmunk-physics.net/) - A fast and lightweight 2D game physics library.
* [Cocos2D](https://github.com/los-cocos/cocos) - graphic library for games and multimedia, for python language 🅾️
* [Cocos2d-x](http://cocos2d-x.org/) - a C++ OpenGL 2D and 3D game engine. Uses C++ but has JS and Lua bindings. Target all the major mobile platforms and operating systems. Additional tools CocoStudio and Cocos Code IDE. 🆓
* [Construct 2](https://www.scirra.com/) - an HTML5 game maker, meaning you are not actually writing JavaScript. Instead, you use actions, events and conditions to do the heavy lifting. 🚩
* [Coquette](http://coquette.maryrosecook.com/) - A micro framework for JavaScript games. Handles collision detection, the game update loop, canvas rendering, and keyboard and mouse input.
* [Corona SDK](https://coronalabs.com/) - A Cross-Platform Mobile App Development for iOS and Android.
* [Defold](http://www.defold.com/) 2D game engine by King 🆓
* [Duality](http://duality.adamslair.net/) - C# / OpenGL 2D Game Engine that comes with visual editor.
* [ENGi](https://github.com/ajhager/engi) - A multi-platform 2D game library for Go. 🅾️
* [Ejecta](http://impactjs.com/ejecta) - A Fast, Open Source JavaScript, Canvas & Audio Implementation for iOS. 🅾️
* [EnchantJS](http://enchantjs.com/) - A simple JavaScript framework for creating games and apps.
* [Farseer](http://farseerphysics.codeplex.com) - a collision detection system with realistic physics responses.
* [FlashPunk](http://useflashpunk.net/) - free ActionScript 3 library designed for developing 2D Flash games.
* [Flixel](http://flixel.org/index.html) - an open source game-making written in ActionScript3. 🅾️
* [GameMaker](http://www.yoyogames.com/studio) - 2D Game Engine 🚩
* [GameSalad](https://gamesalad.com/) - Game Creation Engine for Mac and Windows.
* [Gideros](http://giderosmobile.com/) - Mobile Cross-Platform framework using Lua programming language. 🅾️
* (Gosu)(https://www.libgosu.org/) - 2D game development library for Ruby and C++ 🅾️
* [HaxeFlixel](http://haxeflixel.com/) - Create cross-platform games easier and free.
* [ImpactJS](http://impactjs.com/) - Impact is a JavaScript Game Engine that allows you to develop stunning HTML5 Games for desktop and mobile browsers.
* [Jitter](https://code.google.com/p/jitterphysics/) - a fast and lightweight physics engine written in C#.
* [Juno](https://github.com/rxi/juno) - Framework for making 2D games with chunky pixels in Lua 🅾️
* [Kivent](http://kivent.org/) - A 2D game framework for Kivy.
* [Kivy](http://kivy.org) - Cross platform Python framework for creating apps and games for Linux, Windows, OS X, Android and iOS
* [KiwiJS](http://www.kiwijs.org/) - a fun and friendly Open Source HTML5 Game Engine. Some people call it the WordPress of HTML5 game engines 🅾️
* [LibGDX](https://libgdx.badlogicgames.com/) - Powerful (totally free) library for Java, code once and run the game on desktop, Android, Web, and iOS. 🅾️
* [LimeJS](http://www.limejs.com/) - HTML5 game framework for building fast, native-experience games for all modern touchscreens and
* [Lums](https://github.com/lums-proj/Lums) - A 2D / 3D framework written in C++11. Very efficient and modern. Still under heavy development. 🅾️
* [LÖVE](http://love2d.org) - Lua 2D Game Engine. 🅾️
* [MINX](https://github.com/GearChicken/MINX) - Open Source 2D game framework written in C++ (to the style of XNA) 🅾️
* [MOAI](http://getmoai.com/) - Cross-Platform framework designed for pro game developers to create iOS, Android, Windows, Linux, Chrome and OSX games using C++, OpenGL and Lua scripting.
* [Matter.js](http://brm.io/matter-js/) - a 2D physics engine for the web.
* [MelonJS](http://melonjs.org) - open source light-weight HTML5 game engine. 🅾️
* [Monkey X](http://www.monkey-x.com) - Multi-platform programming language and cross-compiler, aimed at fast game programming.
* [Monogame](http://www.monogame.net/) - Open Source implementation of the Microsoft XNA 4 Framework. 🅾️
* [NodeBox](https://www.nodebox.net/) - a family of Python tools to create generative design.
* [Open Mega Engine](https://github.com/rafaelcp/Open-Mega-Engine)
* [OpenFL](http://www.openfl.org/) - Open Source Haxe Engine for making multi-platform games. 🅾️
* [OpenRA](http://www.openra.net/) - OpenRA is a Libre/Free Real Time Strategy Game Engine.
* [Origamijs](http://origamijs.com/docs) - Lightweight Library to create using HTML5 Canvas.
* [PICO-8](http://www.lexaloffle.com/pico-8.php) - A fantasy console for making, sharing and playing tiny games and other computer programs.
* [PandaJS](http://www.pandajs.net/) - Open Source HTML5 Engine. 🅾️
* [Phaser](http://phaser.io/) - free and fast 2D game framework for making HTML5 games for desktop and mobile web browsers, supporting Canvas and WebGL rendering.
* [PixiJS](http://www.pixijs.com/) - is a newcomer HTML5 game renderer - first released in early 2013. A main appeal of the engine is its use of WebGL for faster performance. If WebGL isn't supported, the engine falls back to standard canvas.
* [Processing](https://www.processing.org/) - Processing is a programming language, development environment for artists, designers, researchers.
* [PuzzleScript](http://www.puzzlescript.net/) - open-source HTML5 puzzle game engine.
* [PyGame](http://pygame.org/hifi.html) - a 2D game engine in Python. 🆓
* [QICI](http://www.qiciengine.com/) - Efficient web-based tool for creating HTML5 games.
* [RPGMaker](http://www.rpgmakerweb.com/) - series of programs for the development of role-playing games. 💲
* [Ren'Py](http://www.renpy.org/) - An open-source visual novel engine using the Python language in simplified form. It supports Windows, Mac OS X, Linux, Android and iOS.
* [Rpgboss](http://rpgboss.com) - A 2d rpg game engine and editor based on scala and libgdx. Ease of use, with no programming knowledge.
* [SDL](http://libsdl.org/) - SDL is a cross-platform library designed to provide low level access to audio, keyboard, mouse, joystick, and graphics hardware via OpenGL and Direct3D. 🆓
* [SFML](http://www.sfml-dev.org/) - Simple and Fast Multimedia Library. 🆓
* [Solarus](http://www.solarus-games.org/) a free and open-source Action-RPG (Zelda) game engine 🆓
* [SpriteBuilder](http://www.spritebuilder.com/) - Open Source Game Development Suite for MacOS 🅾️
* [SpriteKit](https://developer.apple.com/library/ios/documentation/GraphicsAnimation/Conceptual/SpriteKit_PG/Introduction/Introduction.html) - iOS/Mac 2D Game Engine.
* [Stage.js](http://piqnt.com/stage.js/) - Lightweight and fast 2D HTML5 rendering and layout engine for cross-platform game development.
* [Starling](http://gamua.com/starling/) - The GPU powered 2D Flash API
* [Stencyl](http://www.stencyl.com/) - a game creation platform that allows users to create 2D video games for computers, mobile devices, and the web.
* [TIC - Tiny Computer](http://nesbox.com/tic/) - a tiny computer where you can make, play and share tiny games.
* [XNA](http://mxa.codeplex.com/) - Microsoft's game development framework.
* [iio.js](https://github.com/iioinc/iio.js) - A javascript library that speeds the creation and deployment of HTML5 Canvas applications 🅾️
* [p2.js](http://schteppe.github.io/p2.js/) - JavaScript 2D physics library 🅾️
3D Engines and Frameworks
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* [Azul3D](http://azul3d.org/) - A 3D engine written in Go.
* [Blend4Web](http://www.blend4web.com/) - A Javascript framework for creating and displaying interactive 3D computer graphics in web browsers. 🅾️
* [Blitz3D](http://www.blitzbasic.com/Products/blitz3d.php) 3D basic-like programming language for fast 3D desktop games.
* [Bullet](http://bulletphysics.org/wordpress/) - Real-time physics simulation.
* [CRYENGINE](https://github.com/CRYTEK-CRYENGINE/CRYENGINE) - A pay what you want next gen 3D game engine written in C++. 🅾️
* [Cinder](https://libcinder.org/) - Cinder is a community-developed, free and open source library for professional-quality creative coding in C++. 🅾️
* [Dash](https://github.com/Circular-Studios/Dash) - A free and open 3D game engine written in D. 🅾️
* [Godot](http://www.godotengine.org/) - An advanced, feature-packed, multi-platform 2D and 3D open-source game engine. 🅾️
* [Havok Vision](http://www.havok.com/vision-engine/) - a cross-platform game engine that provides a powerful and versatile multi-platform runtime technology.
* [Haxor](http://www.haxor.xyz/) - Combine the power of HaXe language and HTML5+WebGL to easily develop powerful applications that can run in any modern browser.
* [Hive3D](http://www.eyelead.com/hive/) - Real Time Collaboration 3D engine.
* [Horde3D](http://www.horde3d.org/) - small open source 3D rendering engine. 🅾️
* [Irrlicht](http://irrlicht.sourceforge.net/) - open source high performance realtime 3D engine written in C++. 🅾️
* [JPCT](http://www.jpct.net/) - jPCT is a 3D engine for desktop Java and Google's Android.
* [Lumberyard](https://aws.amazon.com/pt/lumberyard/) - Amazon Lumberyard is a free AAA game engine deeply integrated
* [ODE](http://www.ode.org/) - ODE is an open source, high performance library for simulating rigid body dynamics. 🅾️
* [Ogre3D](http://www.ogre3d.org/) - is a scene-oriented, real-time, flexible 3D rendering engine (as opposed to a game engine) written in C++.
* [Panda3D](https://www.panda3d.org/) - a framework for 3D rendering and game development for Python and C++ programs.
* [Paradox](http://paradox3d.net/) - Open Source C# Game Engine. 🅾️
* [Piston](http://www.piston.rs/) - a modular open source game engine written in Rust. 🅾️
* [PlayCanvas](https://playcanvas.com/) - A WebGL Game Engine.
* [Polycode](http://polycode.org) - Open-Source Framework for creating games in C++ (with Lua bindings).
* [Rajawali](https://github.com/Rajawali/Rajawali) - Android OpenGL ES 2.0/3.0 Engine 🅾️
* [Source](https://developer.valvesoftware.com/wiki/Main_Page) Valve's Flagship engine 🆓
* [Spring](http://springrts.com/) - A powerful free cross-platform RTS engine.
* [Stingray](http://www.autodesk.com/products/stingray/) - 3D game engine and real-time rendering software 💲
* [Superpowers](https://sparklinlabs.itch.io/superpowers) - HTML5 Collaborative 2D/3D Game Maker
* [Three.js](http://threejs.org/) - Javascript 3D Library.
* [Turbulenz](http://biz.turbulenz.com/developers) - Turbulenz offers the ability to build, publish, iterate and monetise high-quality games that react like no others, with immersive 3D effects and real-time physics that open up a whole new world of unprecedented and extraordinary web content.
* [Unity 3D](http://unity3d.com/) - A development engine for the creation of 2D and 3D games and interactive content.
* [Unreal Engine 4](https://www.unrealengine.com/) - the new game engine technology developed by Epic Games.
* [Urho3D](http://urho3d.github.io/) - Cross-platform rendering and game engine. 🅾️
* [Wave](http://waveengine.net/) - Cross-platform engine written in C#
* [WhiteStorm.js](https://github.com/WhitestormJS/whitestorm.js) - 3d javacript framework for building apps and games 🅾️
* [bgfx](https://github.com/bkaradzic/bgfx) - Cross-platform, graphics API agnostic, "Bring Your Own Engine/Framework" style rendering library. 🅾️
* [gameplay](http://gameplay3d.io/) - A free, open-source, cross-platform, 2D + 3D game framework written in C++. It is aimed towards indie game developers who are creating desktop and mobile games.
* [jMonkeyEngine 3](http://jmonkeyengine.org/) - a 3D open-source game engine for adventurous Java developers.
* [voxel.js](http://voxeljs.com/) - voxel.js is a collection of projects that make it easier than ever to create 3D voxel games like Minecraft all in the browser.
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* [Fusion Character Animator](http://loopengo.free.fr/) - small tool for Clickteam Fusion 2.5 to facilitate the animation of 2D character sprites for developers. 💲
* [ScreenToGif](https://screentogif.codeplex.com/) - record a selected area of your screen and save it as a Gif 🆓
* [Spine](http://esotericsoftware.com/) - Spine is dedicated to 2D animation, providing an efficient workflow both for creating amazing animation and for integrating it into your games. 💲
* [Spriter](http://www.brashmonkey.com/spriter.htm) - Modern tool for sprite animation. 💲
* [DragonBones](http://dragonbones.effecthub.com) - The Open Source 2D skeleton animation solution for Flash 🅾️
* [LWF](http://gree.github.io/lwf/) - Lightweight SWF. LWF is an animation engine which can play animation data converted from FLASH contents in HTML5, Unity, Cocos2d-x, iOS UIKit, and more. 🅾️
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* [FilterForge](https://www.filterforge.com/) - A plugin for Adobe Photoshop that allows you to build your own filters. 💲
* [PixPlant](http://www.pixplant.com/) - Smart 3D texturing tool that creates high quality normal, displacement, specular maps and seamless textures from photos. 💲
* [STG](http://www.seamlesstexturegenerator.com/) - a tool for creating professional seamlessly-tileable textures from photographs quickly and easily. 💲
Tile/Level Editors
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* [ArrayPainter](http://www.arraypainter.com/) - Array Painter is the easiest and fastest way to make 2D arrays ready for copy pasting into your own program.
* [AutoTileGen](http://pixelatto.com) - AutoTileGen is an automatic tileset generator for 2D game terrains. 💲
* [OGMO Editor](http://www.ogmoeditor.com/) - generic level editor. 🅾️
* [Overlap2D](http://overlap2d.com/) - a 2D level and UI editor with an engine agnostic philosophy. 🅾️
* [Mappy](http://tilemap.co.uk/mappy.php) - Free tilemap editor. 🆓
* [Tiled](http://www.mapeditor.org/) - free, easy to use and flexible tile map editor. 🆓
Vector/Image Editor
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* [Gimp](http://www.gimp.org/) - GNU Image Manipulation Program. It is a freely distributed piece of software for such tasks as photo retouching, image composition and image authoring. 🅾️
* [Inkscape](https://inkscape.org/en/) - An open-source vector graphics editor similar to Adobe Illustrator, Corel Draw, Freehand, or Xara X. 🅾️
* [Krita](https://krita.org/) - Sketching and painting, offering an end-to-end solution for creating digital painting files from scratch by masters. 🅾️
* [Ormr](http://thebloomapp.com) - Ormr is a fast, light-weight, cross-platform procedural graphics editor.
* [Paint.NET](http://www.getpaint.net/) - Paint.NET is free image and photo editing software for PCs that run Windows. 🆓
* [Pixelmator](http://www.pixelmator.com) - Full-featured image editing app for the Mac
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