Browse free open source Chess Engines and projects for Mac below. Use the toggles on the left to filter open source Chess Engines by OS, license, language, programming language, and project status.

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  • 1
    Stockfish

    Stockfish

    UCI chess engine

    Stockfish is a free, powerful UCI chess engine derived from Glaurung 2.1. Stockfish is not a complete chess program and requires a UCI-compatible graphical user interface (GUI) (e.g. XBoard with PolyGlot, Scid, Cute Chess, eboard, Arena, Sigma Chess, Shredder, Chess Partner or Fritz) in order to be used comfortably. Read the documentation for your GUI of choice for information about how to use Stockfish with it. Stockfish is a 11-time winner of the Top Chess Engine Championship. Stockfish is open source (GPLv3 license). That means you can read the code, modify it, and contribute back. You can use Stockfish on your computer or on your iOS or Android device. So you can get world-class chess analysis, wherever you are. The Stockfish engine features two evaluation functions for chess, the classical evaluation based on handcrafted terms, and the NNUE evaluation based on efficiently updatable neural networks.
    Downloads: 208 This Week
    Last Update:
    See Project
  • 2
    Chess engine code name "Gull"
    Downloads: 24 This Week
    Last Update:
    See Project
  • 3
    DreamChess

    DreamChess

    OpenGL chess game

    A portable chess game consisting of an xboard-compatible OpenGL user interface with 2D and 3D board views and a chess engine. The primary targets are Windows, Mac OS X and Linux.
    Downloads: 15 This Week
    Last Update:
    See Project
  • 4
    Mediocre is a Java-based chess engine, implementing features like LMR, SEE, history and killer moves heuristics, transposition tables, internal iterative deepening, PVS search etc.
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    Downloads: 10 This Week
    Last Update:
    See Project
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  • 5
    yet another UCI chess engine
    Downloads: 10 This Week
    Last Update:
    See Project
  • 6
    jose is a graphical Chess tool. >>> moved to https://peteschaefer.github.io/jose <<< You can store chess games in a database. You can view and edit games (including variations and comments). You can play against a plugged-in chess engine and use it for analysis. Features 3D board view.
    Downloads: 16 This Week
    Last Update:
    See Project
  • 7
    Crafty Chess Interface

    Crafty Chess Interface

    free open-source chess engine interface

    latest portable distribution: https://sourceforge.net/projects/craftychessinterface/files/crafty_gui_10.7z/download
    Downloads: 10 This Week
    Last Update:
    See Project
  • 8
    Phalanx is a chess engine which understands the xboard protocol. It's suitable for beginner and intermediate players (I'm counting on your help to make it suitable for strong players!)
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    Downloads: 12 This Week
    Last Update:
    See Project
  • 9

    ChessbrainVB

    EXCEL VBA chess engine with chess board

    VBA chess engine for EXCEL / WORD / POWERPOINT ( level: 2200 ELO ) with chess board GUI. Full EXCEL install needed (no viewers or OpenOffice) also: VisualBasic 6 compile for winboard (2750 ELO), needs a chess GUI like ARENA latest version here: https://github.com/RZulu54/ChessBrainVB/releases
    Downloads: 9 This Week
    Last Update:
    See Project
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  • 10

    GreKo

    Chess engine

    Winboard/UCI chess engine
    Downloads: 5 This Week
    Last Update:
    See Project
  • 11
    Redqueen Chess Engine
    Redqueen is an UCI (Universal Chess Interface) only compatible chess engine written in C++.
    Downloads: 4 This Week
    Last Update:
    See Project
  • 12
    BagaturChess

    BagaturChess

    Java Chess Engine

    This is UCI Chess Engine writen in Java. Since version 1.4 (inclusive) the project was moved to https://github.com/bagaturchess/Bagatur
    Downloads: 3 This Week
    Last Update:
    See Project
  • 13
    Chess-gambiteer

    Chess-gambiteer

    Chess training program playing gambits

    Program to train against gambit play (*) with the computer, with a strength adjustable chess engine (Danasah, currently set at approx 1400 EL0 when playing against it). Also included now are two options to watch an engine e.g. the 'aggressive' Patricia5 (with gambits) play against another engine (eg IM level). The engine gambit books are made in such a way that 1) real lousy gambits are not played, and 2) the book is choosing a gambit line as often as possible, so for Black it might go for e.g. a Benko gambit or so and if you let it play with White, a lot of 1.e4 gambits can be played. Thereby, if you try a gambit yourself, the program might try to a counter-gambit (or sometimes an unconventional line). It will play weak against other engines, and it not meant as to play very strong/perfectly, but for human opponents, the gambit lines will most often result in entertaining -not boring- games, and require quite some concentration to avoid tactical mistakes.
    Downloads: 3 This Week
    Last Update:
    See Project
  • 14

    NetChess

    NetChess to play between two players over net or internet

    NetChess is a Graphical User Interface (GUI) for playing chess game. This software can be used To play chess between two players over network using TCP/IP (LAN) or in internet/intranet (Network vs Network) To send instant message (chat) while playing chess To observe the chess game played between two players over network To play chess between two players on the same board As PGN, FEN, EPD converter. This can be used To convert PGN to FEN or EPD format To convert FEG to PGN or EPD format To convert EPD to PGN or FEN format As PGN, FEN or EPD gave viewer. Load multiple games. This can also be used to load the games and analyze using chess engines To play chess using chess engines (Supports engines with WinBoard 1, 2 and UCI 1, 2 protocols) Human vs Chess Engine with White side Human vs Chess Engine with Black side Chess Engine with White side vs Chess Engine with Black side on the same board Chess Engine with White side vs Chess Engine
    Downloads: 5 This Week
    Last Update:
    See Project
  • 15
    Chess Editor is a pure Java tool to create, edit and view chess games in the Portable Game Notation (PGN) format. The tool integrates with externally specified chess engine programs to provide analysis of board positions.
    Downloads: 4 This Week
    Last Update:
    See Project
  • 16
    An open source chess engine in C, released under the GPL. Compatible with the XBoard and UCI interface protocols to link to a GUI or other chess arbiter.
    Downloads: 3 This Week
    Last Update:
    See Project
  • 17

    rodent chess

    UCI chess engine

    Rodent is an UCI chess engine based on Sungorus by Pablo Vazquez, 300 Elo stronger than its predecessor. It allows setting up different personalities and to adjust playing strength.
    Downloads: 3 This Week
    Last Update:
    See Project
  • 18
    Conqueror Chess Engine

    Conqueror Chess Engine

    A powerful chess engine written in C++

    A powerful chess engine written in C++. It currently implements hybrid board representation, alphabeta pruning, quiescence search, static evaluation, legal move generator, iterative deepening, MVV/LVA move reordering, makemove, unmakemove and uci move representation standard, tapered evaluation. Elostat gives the current version an ELO of 2100 measured over 50 games.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 19

    Cave Chess

    A Java chess engine using xboard protocol

    Downloads: 1 This Week
    Last Update:
    See Project
  • 20
    Cassandre is an extensible chess engine written in C++, it is Winboard/XBoard compliant.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 21

    Chesser

    A Chess Engine derived from Winglet

    Chesser is a Bitboard chess engine based on Stef Luijten's Winglet Chess Engine. This program came into existence because I saw a huge room for improvement in Winglet.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 22
    Fen2Pdf

    Fen2Pdf

    Tool for chess teachers to create PDF files with chess diagrams in it

    Tool for chess teachers to create PDF files with chess diagrams in it. 1) Create a pgn file with chess diagrams (FEN notation) in it (e.g by using lichess) 2) Open the Fen2Pdf and select the folder containing the pgn(s) 3) Click start. Fen2Pdf detects the pgn files in it and creates a pdf file You can now print this file and hand the exercises over to your students Extra features: * Mirror the positions. This is handy if you want the same problems presented for the other color for educational purposes. You could present the same set of exercises in 2 different ways! * You can toggle the display of page numbers * The selected pgn folder is saved for next time * The title on the pages is the name of the pgn (without .pgn)
    Downloads: 1 This Week
    Last Update:
    See Project
  • 23

    JChess

    The Java Chess Engine

    This library is an attempt to create a flexible chess engine using the Java programing language. The main diference than others chess engine's is that it is only a library, and it can be attached to any program, including a web application. If you are interested to contribute please contact me. Francisco Rafael Del Roio <francipvb@hotmail.com>.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 24

    Javascript Universal Chess Interface

    Port of UCI to Javascript

    An interface for javascript chess engines to the UCI (universal chess interface) protocol. This allows javascript chess engines to be launched in most chess guis. The progam is based on the Google V8 Javascript Engine. This program expects the path to the .js file of the engine in the first parameter. A wrapper for the open source Javascript Engine p4wn by Douglas Bagnall is provided as an example. A successful and very complete implementation is the Javascript Chess Engine Lozza by Colin Jenkins. The webpage also includes a simple step-by-step guide setting up jsuci with Lozza. http://op12no2.me/toys/lozza/ You may also want to try connecting this javascript translation of the chess engine Stockfish 5 to jsuci: https://github.com/exoticorn/stockfish-js
    Downloads: 1 This Week
    Last Update:
    See Project
  • 25
    MinkoChess
    MinkoChess is a multiplatform chess engine written in C++.
    Downloads: 1 This Week
    Last Update:
    See Project
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