Photo Monitoring Plugin
Ned Horning (read original announcement here) has released an open source plugin for the cross-platform ImageJ. It can produce NDVI composites from infrared and visible image pairs as well as infrablue images.
- Download on GitHub: https://github.com/nedhorning/PhotoMonitoringPlugin/tree/master/downloads
- View source on GitHub: https://github.com/nedhorning/PhotoMonitoringPlugin
- Download ImageJ: http://rsb.info.nih.gov/ij/
- Download the friendlier Fiji version of ImageJ: http://fiji.sc/wiki/index.php/Fiji