http://rangemaster.com/
Click on "Dry Fire Drills" in the left column.
There are 6 electronic dryfire targets you can run on your computer. These include popup Bullseye and IDPA targets, and moving bullseye targets.
As the instructions say: "Please make sure your gun is UNLOADED before you use this dryfire page."
![Wink ;-)](./images/smilies/icon_wink.gif)