Picasso is a high quality vector graphic rendering library. It supports paths, matrices, gradients, patterns, images, and TrueType fonts. It is like Cairo, GDI Plus, and Quartz2D. It is based on AGG for raster rendering.
Vectorz is a fast double-precision vector and matrix math library for Java. It's meant for use in games, simulations, raytracers, etc., where fast vector math is important. It can do over one billion 3D vector operations per second on a single thread.