This is a very good site: http://www.365chess.com/
Free Javascript tool at http://www.chesslive.de/js/apps/onlinedb/
You can get Chessbase online App for your Android at https://play.google.com/store/apps/details?id=chessbase.android.chessdb&hl=en or iphone at https://itunes.apple.com/us/app/chessbase-online/id417726752