erato-tk

Graphical Sieve of Eratosthenes demo in Tcl/Tk. Run at the command line with the length of one side of the square of numbers you want to find primes in as the only parameter. (i.e. 10 for a 100-cell square, etc.) Should work fine on Linux or OS X installs, since they usually have the wish executable in the normal place. On Windows you may have to run this from inside a GUI environment such as ActiveState Tcl.