I made these animated gifs using
<p> True basic, a commerical version of BASIC written by Kemeny & Kurtz
<p> PBMPLUS, a freeware graphics conversion program by Jef Poskanzer
<p>
<a href="http://www.informatik.mu-luebeck.de/~kulow/animator/animator.zip">
Animator</a>  a freeware - gifs to animated gifs program - by Steven
Kulow.

<p><hr><p>
Example true basic source code:
<a href="wiggb.tru">wiggb.tru</a><br>
<a href="http://www.truebasic.com">
Truebasic home page</a>