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If you are programming a card game and are looking for free cards, Cardpics was made for you! Get a set of cards and include them in your project, as soon as your project is free.

License: free

TransGaming's WineX is "an alternative implementation of Microsoft's Win32 Application Programming Interfaces (API), which form the basis of all Windows software, from spreadsheets to video games. The Win32 APIs themselves are extremely broad, covering thousands of functions including graphics, window management, memory, file and disk access, communications, and so on. By migrating the APIs to alternate platforms and mapping hardware accelerated DirectX calls to these platforms, TransGaming's portability solution achieves a unique compatibility that, in some cases, allows many Windows games to run directly out of the box, and without a significant performance penalty."

License: commercial (Subscription service)

Additional System Requirements: Good 3D Card (NVIDIA recommended)

ClanLib is a medium level development kit. At its lowest level, it provides a platform independent way of dealing with display, sound, input, networking, files, threadding and such.

On top of that, ClanLib builds a generic game development framework, giving you easy handling of resources, network object replication, graphical user interfaces (GUI) with theme support and more.

The goal of ClanLib is to allow the game developer to focus on stuff that matters, avoiding all those nasty (and boring) lowlevel trivials like setting up windows, sound mixing, loading images, etc. All those things are simplified into object oriented classes and function calls, making it a joy to write your game.

ClanLib currently supports GNU/Linux and Windows platforms.

ClanLib features:

• Hardware accelerated 2D graphics
• Sound support.
• Input support (keyboard, mouse, joysticks).
• Network support.
• Image loading (jpeg, png, pcx, tga).
• Font support.
• Collision Detection
• Themable GUI.

License: free

The Crate Game Engine is a library designed for creating multiplayer adventure style games. Currently, the engine is capable of loading and playing a console based game from an XML file describing the game world. Scripting support is coming next, followed by graphical support. The game genre that the engine supports is most accurately described as adventure game - board game hybrid. Anyone familiar with Jones in the Fast Lane by Sierra will have an idea as to where the engine is headed.

License: free

CEL provides the notion of entities and property classes for the Crystal Space 3D engine to aid game creation. Every object in a game is represented by an entity. The entity system allows the game programmer (using CEL) to speak to game objects in a consistant manner. Examples of entities are: the player, the world itself, creatures, a candle, objects in general, items, ...

CEL is logically split into two major parts: a physical layer, which defines the way entities interact with the world and each other, and a behavior layer, which controls how entities behave within the constraints put forth by the physical layer.

License: free

Additional System Requirements: Crystal Space 3D engine

A free, portable 3D engine with a ton of features.

Crystal Space is currently under heavy development, but it's already quite impressive. The engine supports stencil shadows, lightmaps, shaders, portals, mirrors, scripting, 3D acceleration and lots more. It compiles and runs on GNU/Linux, Windows and MacOS/X.

The Crystal Space project's aim isn't to produce a game, but rather a flexible, portable 3D engine.

License: free