Laser Tag 2.0 is a Graffiti Research Lab project and is written by Theodore Watson and Zachary Lieberman using openFrameworks. It may be used free of charge as long as it is not used for marketing, advertising or promotion.

Some new features:
- 4 main brush modes - each with their own qualities and different brush types.
- You can design your own brushes by making png files.
- If you want to code your own brushes there is a super simple system for that too.
- Built in music player for playing your party jams while Laser Tagging.
- Network connection for sending the laser tag data to flash, Processing, openFrameworks, Max / Msp etc.
- Color! - editable color xml file - add up to fifty brush colors - works with all brushes.

The equipment:
Here is the essential equipment you will need for your Laser Tag system.
1x fast laptop (PC or Mac) that can connect to an external monitor. It helps if the laptop has a dedicated graphics card, so a Macbook Pro would be preferable to a Macbook for this reason (though macbooks seem to run it just fine!).
1x video camera that you can connect to your laptop. Video cameras that have manual controls tend to be a lot better at tracking the laser than ones that automatically adjust the image depending on how bright it is.
1x projector. Anything over 2000 lumens should be good. 1x laser pointer between 5mW and 80mW in power.

Download the software and see the howto here.