Here is a list of standalone engines that support WinBoard/UCI protocol, have their own built-in GUI (respectively are delivered with other interfaces) and do not require additional front-ends - see Chessforeva with a collection of well-known programs (Javascript)

• Absolute Zero - proprietary interface without commandline parameter -u (for UCI-protocol)

• Acqua - Lucas Chess by Lucas Monge

• AICE - GUI is Arena by Martin Blume / Michael Diosi

• Alaric - Lucas Chess by Lucas Monge

• Alf - SJCE by Roman Koldaev a.k.a harp07

• Alfil
  • Arena by Martin Blume / Michael Diosi
  • GUI is WinBoard by Alessandro Scotti / H.G. Muller / Tim Mann

• Amyan
  • Lucas Chess by Lucas Monge
  • Standalone Application

• Andscacs - Lucas Chess by Lucas Monge

• Animats Chess - SJCE by Roman Koldaev a.k.a harp07

• AnMon - GUI is Arena by Martin Blume / Michael Diosi

• AntiCrux - AI for Antichess

• Arabian Knight - SJCE by Roman Koldaev a.k.a harp07

• Arasan
  • SieberNET
  • Windows Installer

• Armageddon Chess - PH Download

• Arminius
  • Arena by Martin Blume / Michael Diosi
  • Lucas Chess by Lucas Monge

• Atak

• Baby Chess - Engine - GitHub

• Bagatur - GUI is Chess Art for Kids - SJCE by Roman Koldaev a.k.a harp07

• Beowulf
  • LiliaChess by Carlo Bellentani
  • Net Blitz II by Sébastien Lachance and Yannick Létourneau

• BeRoChess

• Betsy - GUI is Arena by Martin Blume / Michael Diosi

• BigLion - Chess GUI

• BikJump - Lucas Chess by Lucas Monge
• Brembo CE - SJCE by Roman Koldaev a.k.a harp07

• Bringer - James Kearman´s website - Scacchi & Computer

• Butterfly Chess - Tarrasch Chess GUI

• CalculonX - SJCE by Roman Koldaev a.k.a harp07

• Capa chess (not yet enabled in the beta version)

• Carballo - Chess Application - GWT Interface - SJCE by Roman Koldaev a.k.a harp07

• Cave Chess - SJCE by Roman Koldaev a.k.a harp07

• CDrill - Python Easy Chess GUI by Ferdinand Mosca

• CeruleanJS

• Chenard

• Cheng - Lucas Chess by Lucas Monge

• Chess 4.x - Chess and OBender (formerly QChess)- GUI is EchoBoard

• Chess22k - SJCE by Roman Koldaev a.k.a harp07

• Chess Alex

• Chess-at-nite - GUI is WinBoard by Alessandro Scotti / H.G. Muller / Tim Mann

• ChessBin - CNET

• ChessBot by Alexander Soto - Java Edition by Alexander Hörtenhuber - SJCE by Roman Koldaev a.k.a harp07

• ChessDBlet - ChessDB

• Chessmaster - Ubisoft

• Chesster

• Chessterfield

• ChessV - Release Candidate 2

• Chispa
  • Arena by Martin Blume / Michael Diosi
  • Lucas Chess by Lucas Monge

• CINAG

• Cinnamon
  • JavaScript Version
  • Lucas Chess by Lucas Monge
  • Tarrasch Chess GUI by Bill Forster

• Clarabit - Lucas Chess by Lucas Monge

• Cmcchess

• Comet - D-Fend Reloaded

• Conqueror Chess Engine - GUI is WinBoard

• Crafty
  • Aquarium - Chess Assistant by Convekta Ltd
  • Chess Giants (with an appearance like Chess Titans) by Pierre-Marie Baty
  • Chess Informant Expert Lite by Sahovski Informator
  • ChessRally by Ingenuware Ltd
  • Crafty Chess Interface by Valters Baumanis
  • FBChess by Chessforeva
  • fl Chess by Falco Software
  • Gambit for Mac PPC (not supported since Mac OS X 10.7 "Lion") by Aqueous Software LLC - no longer available at Kagi supplier store
  • Haundrix Chess by Alex Ignácio da Silva
  • LiliaChess by Carlo Bellentani
  • PGN Mentor by 64 Squares

• Crazybot - Zhouse / Crazyhouse Challenger by Zon Juan Jan

• Critter
  • Chesster - Google Drive by Michael Goode
  • Ethereal Chess 3D by Jordan Sparks
  • LiliaChess by Carlo Bellentani
  • Lucas Chess by Lucas Monge

• Crux - Unregistered Version including GUI

• CuckooChess - SJCE by Roman Koldaev a.k.a harp07

• Cupcake - SJCE by Roman Koldaev a.k.a harp07

• Cyrano - Lucas Chess by Lucas Monge

• Dabbaba

• Daydreamer - Lucas Chess by Lucas Monge

• DeepBrutePOS - SJCE by Roman Koldaev a.k.a harp07

• Deep Bug - Zhouse / Crazyhouse Challenger by Zon Juan Jan

• DeepDuke - GUI is WinBoard by Alessandro Scotti / H.G. Muller / Tim Mann

• DeepFish - GUI is Lucas Chess by Lucas Monge

• Defeo - GUI is Double Chess Board by Dušan Škaloud

• Delfi
  • Aquarium - Chess Assistant by Convekta Ltd
  • GUI is ChessPeer by Sezgin Serin
  • Lucas Chess by Lucas Monge

• DelphiMax

• Demolito - Lucas Chess by Lucas Monge

• Detroid by Viktor Csomor

• Deuterium - Python Easy Chess GUI by Ferdinand Mosca

• DimitriWBE

• DiscoCheck - Lucas Chess by Lucas Monge

• Dolphin Chess

• Dragon - GUI is Arena by Martin Blume / Michael Diosi

• DreamChess

• ECE - Easy Chess Engine

• Eden - SJCE by Roman Koldaev a.k.a harp07

• EnkoChess

• Elf Chess3D

• EXchess (Simple Graphical Version)

• Faile - PouetChess - Frédéric Martin

• Fairy-Max / MaxQi / ShaMax
  • ChessV by Gregory Strong
  • GUI is WinBoard by Alessandro Scotti / H.G. Muller / Tim Mann

• Fire - GUI is HFT-Stuttgart GDV 2013 Schach by Stefan Buettner

• Fischerle - proprietary interface requires DadaChessfield CB-Compatible, a font for creating chessdiagrams by Daniel Kopp - SJCE by Roman Koldaev a.k.a harp07

• Flux - SJCE by Roman Koldaev a.k.a harp07

• Frank Walter - SJCE by Roman Koldaev a.k.a harp07

• FreeChess II

• Frittle - SJCE by Roman Koldaev a.k.a harp07

• Fritz by ChessBase GmbH

• Fruit
  • Chess Giants (with an appearance like Chess Titans) by Pierre-Marie Baty
  • Eschecs by Roland Chastain
  • Lucas Chess by Lucas Monge
  • MasterChess 8000 by Mike Leahy
  • Schach3D - Chess3D by Thomas Schwab Softwareentwicklung
  • WinBoard by Alessandro Scotti / H.G. Muller / Tim Mann

• FSharpChess

• Gaïa - Lucas Chess by Lucas Monge

• Galjoen

• Gambit

• Gambit Fruit - Lucas Chess by Lucas Monge

• GarboChess
  • Javascript Edition by Gary Linscott
  • Lucas Chess by Lucas Monge

• Gaviota
  • Arena by Martin Blume / Michael Diosi
  • Lucas Chess by Lucas Monge

• Geko - GekoBoard

• Gladiator - SJCE by Roman Koldaev a.k.a harp07

• Glaurung
  • Glaurung (Mac OS X version) - Download by Tord Romstad
  • Lucas Chess by Lucas Monge
  • MacBoard 2010 by Wolf Stephan Kappesser - no longer available
  • Schach3D - Chess3D by Thomas Schwab Softwareentwicklung

• GNU Chess
  • 3dMChess by Alessandro Musacchio
  • AmyBoard by Jochen Wiedmann
  • Chess Giants (with an appearance like Chess Titans) by Pierre-Marie Baty
  • Chesstacular by Art aka atimes
  • chessxtra by Alec Vance / Rob Terrell
  • Ceibal-Chess by Alejandro Segovia Azapian
  • CLIM by Stas Boukarev
  • CSBoard by Nickolay V. Shmyrev
  • eBook SDK by Leopoldo Bueno Castillo
  • FreeChess4 by Renaud Helias
  • GALBoard by Maurizio Galeone
  • GNU Chess (Old versions) for Windows ports by Conor McCarthy / Daryl Baker
  • glutboard - OpenGL / GLUT chess board (for GNU Chess) by Burns Ethan
  • Haundrix Chess by Alex Ignácio da Silva
  • LiliaChess by Carlo Bellentani
  • Next Chess Move by Next Chess Move LLC
  • SJCE by Roman Koldaev a.k.a harp07

• Gödel Engine - Lucas Chess by Lucas Monge

• Golem - GUI is LiliaChess by Carlo Bellentani

• GreKo - Lucas Chess by Lucas Monge

• Gromit

• GullChess - Lucas Chess by Lucas Monge

• Hamsters - Lucas Chess by Lucas Monge

• Hermann - GUI is Arena by Martin Blume / Michael Diosi

• Honzovy Šachy

• Hopeless - Clericus GUI

• Horizon Chess - GUI is LiliaChess by Carlo Bellentani

• Houdini
  • Aquarium - Chess Assistant - Chess King - GUIs by Convekta Ltd
  • GUI is Ethereal Chess 3D by Jordan Sparks
  • MasterChess 8000 by Mike Leahy

• IntelliChess - GUI is WinBoard by Alessandro Scotti / H.G. Muller / Tim Mann

• Irina - Lucas Chess by Lucas Monge

• Javalin - SJCE by Roman Koldaev a.k.a harp07
• Jazz

• JChecs - SJCE by Roman Koldaev a.k.a harp07

• JChess - SJCE by Roman Koldaev a.k.a harp07

• Junior
  • Bobby Junior GUI by World Chess Live / Internet Chess Club, Inc - no longer available
  • Yokohama Edition GUI by ChessBase GmbH

• K2 - GUI is Arena by Martin Blume / Michael Diosi

• Kasparov - SJCE by Roman Koldaev a.k.a harp07

• King of Kings - SieberNET

• KingsOut - SJCE by Roman Koldaev a.k.a harp07

• KMTChess - GUI is WinBoard by Alessandro Scotti / H.G. Muller / Tim Mann

• KnightCap (Linux)

• Komodo
  • GUI by ChessBase GmbH
  • Lucas Chess by Lucas Monge
  • Tarrasch Chess GUI

• LeelaChessZero
  • Next Chess Move LLC
  • Nibbler by fohristiwhirl

• Lime - MediaFire - Lucas Chess by Lucas Monge

• Lokasoft - ChessPartner, successor of Schröder B.V. Online Shop - Download
  • Chess Tiger (Native/UCI) by Christophe Théron - no longer available - Chess Light Tiger
  • Deep Sjeng (UCI/WinBoard) by Gian-Carlo Pascutto - no longer available - Sjeng (WinBoard)- Haundrix Chess
  • Gandalf (Native/UCI/WinBoard) by Steen Suurballe - Dutch website of Schröder B.V. - no longer available - Frank´s Chess Page
  • Ktulu (UCI/WinBoard) by Rahman Paidar - no longer available - Freeware
  • Rebel (WinBoard) by Ed Schröder - no longer available - Freeware
  • Rebel Tiger Chess Engine - Features - Introduction - Latest News - Release Notes - Reviews
  • SmarThink (UCI/WinBoard) by Sergei Markoff - no longer available - Lucas Chess by Lucas Monge - Russian main page - SDChess

• Lozza

• Luzhin

• Magnum Chess - SJCE by Roman Koldaev a.k.a harp07

• Mainsworthy

• Mango Paola Ajedrez

• Marquis Chess Engine - Obelisk GUI

• Mediocre Chess - SJCE by Roman Koldaev a.k.a harp07

• MiniChessAI - Simple Chess GUI

• MiniMAX - GUI is CompoChess

• Monarch - Lucas Chess by Lucas Monge

• Mustang
  • LiliaChess by Carlo Bellentani
  • Net Chess by NetIntellGames

• My Amateur Chess Engine (mACE) - Improved Chess Engine (iCE)

• NagaSkaki - SieberNET

• NapoleonPP
  • Scid by Shane Hudson and Pascal Georges
  • Tarrasch Chess GUI by Bill Forster / Triple Happy Ltd

• Naum
  • Chess Coach - discontinued
  • FBChess by Chessforeva
  • MasterChess 8000 by Mike Leahy

• Nemeton

• Nejmet
  • Arena by Martin Blume / Michael Diosi
  • Unregistered Version

• Nero

• Neurosis

• Nimzo - NimzoWerkstatt MCS

• Numbit Chess

• OliThink - SJCE by Roman Koldaev a.k.a harp07

• Omar Chess Engine - Guimar (Windows)

• Onno Chess - development of this project ended

• Pandora Chess (not stable edition) - Balázs Csanád Csáji

• Pawny - Lucas Chess by Lucas Monge

• peaBrain - pChess GUI - Download

• Phalanx
  • Scid by Shane Hudson and Pascal Georges
  • Scid vs. PC by Steven Atkinson

• Phoenix - SJCE by Roman Koldaev a.k.a harp07

• PicoLisp Chess (text-based interface) by Alexander Burger, type to obtain an ASCII board the command $ pil /usr/share/picolisp/games/chess.l -main

• Porucznik - Sierzant - Szeregowiec

• PreChess - NewBoard GUI

• Presbyter - GUI is SJCE by Roman Koldaev a.k.a harp07

• Project Invincible

• Pulsar - GUI is WinBoard by Alessandro Scotti / H.G. Muller / Tim Mann

• Pulse - SJCE by Roman Koldaev a.k.a harp07

• Punica UCI - GUI is WinBoard TC by C. Anzio and A. Barjon

• PyChess (Engine - Client - GUI) by Thomas Dybdahl Ahle / Tamás Bajusz

• PyTuroChamp - Python Chess by Martin C. Doege / Niklas Fiekas

• Quark - GUI is LiliaChess by Carlo Bellentani

• Queen

• Raffaela

• RDChess - Download

• Rival Chess - GitHub - SJCE by Roman Koldaev a.k.a harp07

• ROCE - Lucas Chess by Lucas Monge

• Rodent
  • Lucas Chess by Lucas Monge
  • SimpleChess by Europe Échecs

• Ruffian
  • Aquarium - Chess Assistant by Convekta Ltd
  • Arena by Martin Blume / Michael Diosi
  • Chess Informant Expert (Lite) by Sahovski Informator

• Rumney Chess - GUI is SJCE by Roman Koldaev a.k.a harp07

• Rybka
  • Arena by Martin Blume / Michael Diosi
  • CheekyChess by bingojamigo
  • Lucas Chess by Lucas Monge
  • MasterChess 8000 by Mike Leahy
  • Multiprocessor version - Singleprocessor version - GUIs by Chessbase GmbH
  • Peshk@ Training Courses - GUI by Convekta Ltd
  • Schach3D - Chess3D by Thomas Schwab Softwareentwicklung
  • Tarrasch Chess GUI by Bill Forster / Triple Happy Ltd

• Saruman - Gandalf Chess GUI by Terry Bolt / Conor Griffin / Darragh Griffin

• ScalaChess - ScalaChessGUI by scalachessgui

• Scidlet
  • Scid by Shane Hudson and Pascal Georges
  • Scid vs. PC by Steven Atkinson

• SharpChess - GitHub

• Shikamaru Chess Engine - GUI is Arena

• Shredder
  • UCI (SMP) and Classic for Linux
  • UCI (SMP) and Classic for Macintosh
  • UCI (SMP) and Classic for Windows

• SilChess - Eagle Mode, a ZUI with many features

• Simplex - Lucas Chess by Lucas Monge

• Sjaak
  • ChessV by Gregory Strong
  • Own Interface by Evert Glebbeek
  • PyChess (Engine - Client - GUI) by Thomas Dybdahl Ahle / Tamás Bajusz

• Sjakk (WinBoard Version)

• Sjeng
  • BPGN Viewer by Zon Juan Jan and Sergiy Vasylkevych
  • GUI is Double Chess Board by Dušan Škaloud
  • Haundrix Chess by Alex Ignácio da Silva
  • Suicide / Giveaway Challenger by Zon Juan Jan
  • Zhouse / Crazyhouse Challenger by Zon Juan Jan

• Sloppy - Cute Chess GUI

• SlowChess

• SMIRF - Smirfoglot WinBoard

• SOS - GUI is Arena by Martin Blume / Michael Diosi

• Spark
  • MasterChess 8000 including Spark UCI by Mike Leahy
  • GUI and WinBoard Engine written in Adobe Actionscript 3 - Media Division srl, Romania

• Spike
  • Arena by Martin Blume / Michael Diosi
  • GUI is José Chess Database by Peter Schäfer

• Stan´s Chess

• Stockfish
  • Analyze This Chess by Asim Pereira
  • Arena by Martin Blume / Michael Diosi
  • Chess Application by Laurent Bernabé
  • Chessbeat - server hosts UCI chess engine and play against it from a web browser by Lester Vecsey
  • Chess Giants (with an appearance like Chess Titans) by Pierre-Marie Baty
  • Chess Hero by Innokuo
  • Chess Insight for Mac by Sergii Guslystyi
  • Chessrock by andreyskv
  • Chesster by Basti Tee
  • Chess Wizard by Shanghai Xianqu Info-Tech Co., Ltd
  • CoffeeHouse by Wolf Stephan Kappesser
  • Deep Chess for Windows by Lachezar Balgariev
  • DirtChess by David Lewis
  • droidmate - Android Chess GUI by andreyskv
  • Fancy by Marek Kwiatkowski
  • Forward Chess by WiTechnoME LLC
  • HFT-Stuttgart GDV 2013 Schach by Stefan Buettner
  • ICC Dasher by Internet Chess Club
  • Jerry by Dominik Klein
  • kivy-chess by Shivkumar Shivaji
  • Kvetka by Dimitry Bodiagin
  • Lichess by Thibault Duplessis
  • LiliaChess by Carlo Bellentani
  • Lucas Chess by Lucas Monge
  • MasterChess 8000 by Mike Leahy
  • MinkiChess by MinkiChess.com - Balachandran Subramaniam
  • Next Chess Move by Next Chess Move LLC
  • PyChess (Engine - Client - GUI) by Thomas Dybdahl Ahle / Tamás Bajusz
  • Raptor Chess Interface - GitHub by Carson Day
  • Scid by Shane Hudson and Pascal Georges
  • Shaker - Download by Thomas Petzke
  • stockfisher by Burak Ogan Mancarci
  • Stockfish-GUI for Mac OS X by Daylen Yang
  • UCIApp - GitHub by rasimv
  • Web GUI for Stockfish Chess - GitHub by Dr. R. Urban

• Strelka - MasterChess 8000 by Mike Leahy

• Sunsetter
  • BPGN Viewer by Zon Juan Jan and Sergiy Vasylkevych
  • Double Chess Board by Dušan Škaloud
  • Zhouse / Crazyhouse Challenger by WhoAmI

• Surprise - GUI is LiliaChess by Carlo Bellentani

• Talvmenni - SJCE by Roman Koldaev a.k.a harp07

• Tao - Chess Buddy by Play Buddy, LLC

• Tarrasch Toy Engine
  • Lucas Chess by Lucas Monge
  • Tarrasch Chess GUI by Bill Forster

• Texel - Lucas Chess by Lucas Monge

• The Baron - GUI is LiliaChess by Carlo Bellentani

• The Crazy Bishop - The Chess Level 100 by Rémi Coulom / UNBALANCE Corporation

• Thinker - ThinkerBoard - SieberNET

• Tiffanys - SJCE by Roman Koldaev a.k.a harp07 - commandline parameter xboard (for WinBoard-protocol)

• Toga
  • José Chess Database by Peter Schäfer
  • Lucas Chess by Lucas Monge
  • Scid by Shane Hudson and Pascal Georges
  • Scid vs. PC by Steven Atkinson

• Toledo Chess - Javascript

• TRACE - GUI is WinBoard by Alessandro Scotti / H.G. Muller / Tim Mann

• Tri-language Open Source Chess - SJCE by Roman Koldaev a.k.a harp07

• TSCP
  • ANS Forth Chess by Ian Osgood
  • ChessApp - Java applet by Peter Hunter
  • Chessboard Component by Daniel Terhell

• TwistedLogic - GUI is Schach3D - Chess3D by Thomas Schwab Softwareentwicklung

• Ufim - Lucas Chess by Lucas Monge

• Umko - Lucas Chess by Lucas Monge

• Unidexter - SJCE by Roman Koldaev a.k.a harp07

• Uragano

• Virutor Chess

• Waxman

• Weini - GUI is WinBoard by Alessandro Scotti / H.G. Muller / Tim Mann

• WildCat - GUI by Igor Korshunov - Lucas Chess by Lucas Monge

• WJChess Engine - 2D-GUI

• Yace Paderborn - GUI is ChessPeer by Sezgin Serin

• Zarkov

• Ziggy - SJCE by Roman Koldaev a.k.a harp07

• Ziggurat

• ZZZZZZ - Chess Fonts

===== Contributors =====

Thanks to Norbert Raimund Leisner for creating this list! Additional information from: Lex Domingo.