Stuff that's been on my site for ages

Applets

SimpleMandel lets you explore Mandelbrot images interactively.
Martin Minow's SunSphere applet shows a picture of the rotating earth, complete with sunlight and night shadow
Tetris. Nuff said.
HexCalc is a calculator for integer numbers that can perform bit manipulations base 2, 8, 10 and 10.
Johan van der Hoeven's hilarious Mona Python Nixon applet

Thinking about combining Prolog and Java? A BSF engine for JLog (a Prolog-in-Java system) I created can be found here.
Expr is a Java class that evaluates a mathematical expression by using a recursive-descent parser. It also handles variable substitution. It's useful for evaluating user-entered expressions.
Some Web Dev and JavaScript utilities: a regexp tester, a keycode tester and a plugin lister.
j6502 is a 6502 CPU simulator written in Java. There's also an assembler that generates object code for it. For those too young to remember, the 6502 powered computers such as the Apple //, the Atari 400/800, and various Commodore models like the PET-2001 and the C-64.

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