OpeningTree is described as 'Consolidated view of all your chess games from chess.com, lichess, grandmaster games or custom pgn. Prepare against your opponents by analyzing at their games and see which openings work for you' and is a Chess App in the Games category. There are nine games similar to OpeningTree for a variety of platforms, including Windows, Linux, iPhone, iPad and Mac. The best alternative is Lichess, which is both free and Open Source. Other OpeningTree like games are Chess.com (Freemium), Lucas Chess (Free, Open Source), XBoard (Free, Open Source) and ChessX (Free, Open Source).
Play chess online with millions of players around the world! Enjoy free unlimited games and improve your chess rating with 50,000+ tactics puzzles, interactive lessons and videos, and a powerful computer opponent. Unlock your inner chess master today!
XBoard, also known as WinBoard on Microsoft operating systems, is a free graphical user interface client developed by Tim Mann that is compatible with various chess engines that support the Xboard Communication Protocol such as GNU Chess.