This is the earliest remaining evidence of my software development history.
In the summer after my junior year of High School, I participated in Rose Hulman Institute For Technology's "Operation: Catapult!" summer science institute. I joined a team of peers interested in computer science and graphics, and together we designed and implemented (a wonderful pair of words, those) a 3-D equivalent of the classic game "Cannon Fodder", renamed in honor of the summer program. It was implemented in OpenGL by six students who, coming in, didn't know a lick about that library, and whose grasp of the finer and many of the rougher points of programming was tenuous. Thus the code is awful, terribly designed, but the final product is somewhat pretty and certainly functional.
It's included with a Mac OS X build, but the two source files (such as they are) should compile on any UNIXish system without trouble (provided you link in gl, and glut, and whatnot).