One of the many demos available through the Wolfram Demonstrations Project. This one will take you up to 200 digits. You’ll need to download their Computable Document Format player to get in on the action (and should close your browser while it installs), but these days it requires more effort than ever to participate in the future.
“Thankfully you don’t need to understand the math to look at the pretty pictures.” – Ape Con Myth, Non-professional User
