C-DAC Mumbai is planning a National Conference on Open Source Software -NCOSS'09 May 25th - 26th, 2009 with pre-conference tutorials planned for May 24th 2009, at Mumbai, India. The conference is being conceived of as a forum to bring together the various groups working on developing Open Source Applications catering to specific domains in the ICT world, including education, health, accessibility, localization, e-commerce, disaster management, expert systems, machine learning, etc.