A few simple java applets, relating to interesting mathematical concepts.

	Brownian Motion A very simple 2d random walk.	[launch] [source]
	Geometric Series Conceptual method for visualizing the convergence of geometric series.	[launch][source]

All source code is released under the GNU GPL public license which basically means you’re free to use it as long as your code is under the same license. However, these applets are somewhat immature, and their uses are limited.