Syobon Action is developed by ちく, and Open Syobon Action is developed by 大川和樹.Syobon Action is developed by ちく, and Open Syobon Action is developed by 大川和樹.
Chrome Web Store version is based on Open Syobon Action rc2, and compiled by emscripten.
See also http://sourceforge.net/projects/opensyobon on Open Syobon Action for details.
Note: Musics and SEs are disabled in favor of copyrights.