Adgali
A game library useful for 2D games programmation. It uses the SDL library for the bitmap, sound and events which provides accelerated and portable interfaces for the video and sound hardware. This library tends to provide useful functions for bitmap and sprite display, game GUI, sound events and music, generic AI engine, network management and video streaming.
Documentation Project
Extensive guide, tutorial, and reference with examples for the library as a whole and the individual methods.
Drac Card Game Library
A portable C++ card game library that uses SDL. [Open source, LGPL]
EZ2D
A 2D game engine. It uses SDL as its main API (sorry DirectX users), but very little knowledge of SDL is actually required.
GFX with SDL
A SDL page for beginner's. Tutorials on how to: initialize SDL, load and display images, and how to load sprites.
Kyra
A simple, fully featured, industrial strength sprite engine written in C++. [Free for non-commercial use.]
libksd
A cross-platform game framework (written in C++) that would allow you write your game once and compile it for multiple operating systems and environments, including: Linux/X11, Linux/SVGAlib, MacOs, Windows, and BeOs. [Open Source - LGPL]
SDL Console
An add in console similar to Quake and other game consoles.
SDL Tutorial Wiki
SDL game programming tutorials, source code and links.
SDLMappy
Library that uses 2D tiles based maps created by Mappy. It allows layer transparency, animations, and the creation of up to eight different layers.
SDLSprite
This C++ class contains the data and functions required to display animated sprites from a BMP file.
SDL_gui
A library written in C++ for displaying and controlling user interface elements in an SDL application.
Simple DirectMedia Layer
A cross-platform multimedia library designed to provide fast access to the graphics framebuffer and audio device.
ZXLIB
An object-orientated C++ library for writing 2D games of the sort which used to abound on the ZX Spectrum and its contemporaries. ZXLIB is based on SDL.