Apps by HTML/CSS/JS
Otis.js (beta)
draws Julia sets of zz+C in detail / shows backward dynamics nicely / External rays / Equipotentials
Java Applets (are passé)
OTIS
draws Julia sets of zz+C in detail / shows backward dynamics nicely / External rays / Equipotentials 		Mandel
draws the Mandelbrot set in detail / Real-time Julia tour along any path / Riemann sphere mode
OTIS in the Sea
A variant of OTIS, draws potential functions of J and M `a la 3D. 		Tubes
generates pseudo-3D tube-like objects based on the dynamics of zz+C
Newton
shows the dynamical and parameter planes of Newton's map for F(z)=(z-2)(z+1+C)(z+1-C) / Tubism mode 		Moebius
visualizes actions of real Moebius or complex affine transformations on the Riemann sphere.
Java applets instructions / Full List
(A note on drawing external rays of M)