Thanks a lot. I am trying to learn the use of some softwares listed on webpage http://fossme.bprim.org. I know use of software 'Geogebra' thanks to Dr. Aaloka Kanhere (Homi Babha Centre for science education, Mumbai). Dr. Aaloka Kanhere gives a lecture on use of software 'Geogebra' in PDTO 2011 at IIT Bombay during December 3-5, 2011. Prof. Inder K. Rana (Department of Mathematics, IIT Bombay) is the convener of PDTO 2011 for Uttarkhand School Teachers.