https://github.com/yuzuru2/chat_kai
https://recoil-chat.netlify.app/
https://github.com/cha711/chat-recoil2_
https://nextboard.itsumen.com/
https://github.com/yuzuru2/nextboard
https://github.com/yuzuru2/board_back
https://github.com/yuzuru2/code_front
https://github.com/yuzuru2/code_back
https://play.google.com/store/apps/details?id=com.itsumen.regi&hl=ja
https://github.com/yuzuru2/regi_apuri_sozai