Announced in late 2012, the Center for the Built Environment has developed a web-based thermal comfort tool, which is now available for use: http://cbe.berkeley.edu/comforttool/. From the email announcement, “this free online tool is useful for performing and visualizing comfort calculations according to ASHRAE Standard 55-2010. The tool has been validated against the official ASHRAE Thermal Comfort tool.”
There is now a free, open source plugin for Grasshopper called Ladybug that “allows you to import and analyze EnergyPlus weather data (epw) in Grasshopper and draw diagrams like sun-path, wind-rose, radiation-rose,” can “run radiation analysis, shadow studies, and view analysis,” and then show the results inside Grasshopper, according to the announcement in early 2013. The tool was developed by a graduate student from the School of Design at the University of Pennsylvania.