Bresenham algorhythm for circle and ellipse  2 Kb
There are no trigonometric functions, multiplications or divisions - only addition and subtraction.

Library for JPEG images  400 Kb
Source code is in Pascal, so more folks can understand it. Supports baseline, extended - sequential and progressive compression.

Pascal demos by Jou-Nan Chen  103 Kb
If you can't guess from the name, this programmer is actually a woman. Collection of CHR-fonts, smooth scroll, pallette dealing, rainbow. Some of them are very nice.

Lake when it rains, for Windows  16 Kb
The window of the program is non-rectangular, but round, immitating the surface of a lake when raining. Source code is both in Assembler and C.

Collection of graphic sources by Bas van Gaalen  342 Kb
Contains: fractals, 3D rotation, plasma, textures, viewer for GIF, PCX, BMP, LBM, RIX and CEL files, and more.

Three spline routines  3 Kb
Source is in Pascal. First two procedures draw splines exactly onto the given points, but with third routine splines are under tension by the points.

Large collection of graphical (and other) algorythms, with source code  192 Kb
Sources are in Pascal, C and Assembler at some places. There are described vast variety of algorythms - graphic, music, digital signal processing, number theory, numerical methods, combinatorial, searching and sorting ...