OpenCFU
OpenCFU is a completely open source lightweight application designed to enumerate clustered circular objects such as bacterial colonies. It can handle digital pictures as well as live stream from a video device/webcam. OpenCFU is cross-platform, fast, reliable and allows the user to implement intuitive filters.
Additional information is provided on the website: http://opencfu.sourceforge.net/ OpenCFU is published on PLoS ONE: http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0054072
