For OSX 10.6+ (64bit)
XBoard 4.9 for OSX can be downloaded as an app bundle from here. It is all self-contained with GTK2 running directly through quartz (OSX's native graphic API).
Just copy to wherever you want on the hard drive.
This bundle contains all essential support programs, such as Polyglot and timeseal, pre-installed and ready to run. It contains two demo engines, a native XBoard engine (Fairy-Max 5.0b) and a UCI engine (Fruit 2.1) and, as a bonus, links to the Xboard engine Sjeng (Which is already installed on OSX within the built-in Chess.app). The 4.9 bundle also contains engines for playing Xiangqi (Maxqi, Haqikid, and Eleeye *UCCI*), Shogi (GnuShogi and Shokidoki), and Chu Shogi (HaChu) plus other variants. Also regarding variants, Xboard.app supports other dialects of UCI protocol for variant engines (i.e. UCCI, USI and Cyclone UCI) through the UCI2WB adapter included. *Make sure you are in the appropriate variant before loading such an engine* Also, it now includes HGM's pseudo engine for peer to peer networking which can be used with almost any variant (including custom ones).
For ICS play, the bundle includes launching scripts preset for FICS (Free Internet Chess Server), ICC (Internet Chess Club), and HGM's variant server.
Download
XBoard_4.9.1a_OSX_Intel.dmg (49mb)
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Changes since 4.8.0 bundle for OSX:
Checkout What's New
-Includes new Textures and Themes packs created by myself, Harm Geert Muller, Gorgonian et al. (Located in themes and textures folders in the "places" section of their respective texture dialog box)
-Updated Timeseal for FICS to Timeseal2
-Updated Fairymax 5.0b, UCI2WB, and other included binaries
-Replace bash script ICS launchers with XBoard's own .xop files. (Using terminal is no longer necessary for ICS)
-Move keyboard shortcuts away from the system-wide text editing shortcuts (⌘-A, ⌘-C, ⌘-V, ⌘-X)
-Fullscreen mode no longer crashes on El Capitan (GTK+ Update)
-Save settings on quitting through the menu in OSX App.
-Fix behavior on case-sensitive OS X file systems.
-Fix creation of spurious XBoard instances on OS X
Changes Since 4.9.0 for OSX:
-Various bugfixes
Changes for 4.9.1a
-Fix internal gtk install and image switching now works as intended
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XBoardSg 4.9.1a - Shogi Edition
For OSX 10.6+ (64bit)
This is a version of the XBoard.app configured for Shogi. It contains all the same Shogi equipment as the regular XBoard.app, having all the features of the regular app including localization, plus a few extra things that would have made the app either cumbersome or large for people uninterested in Shogi.
This Includes:
-The Bonanza engine which usually ranks among the top most powerful engines in Shogi. It has been made into an XBoard engine thanks to Harm Geert Muller and supports analysis.
-Harm Geert Muller's exellent shogi engine shokidoki
-GNUShogi adapted to run as an XBoard engine.
-UCI2WB as a USI adapter
Note: So far, GPSShogi is the only known USI engine compiled for OSX. Curiously, they put it in an app bundle despite being a command line unix executable. To install, I find the app must be put in the /Applications folder so it can find its resources. After that, just point XBoardSg.app to the MacOS folder inside the gpsfish app for firstDirectory, select gpsfish for firstChessProgram, and finally check USI in the Load New 1st/2nd Engine dialog
Note2: Most Shogi USI engines are windows only. It is possible to use Wine to get a few of these running on OSX. Just run the engine with the syntax "wine engine.exe" as the launching command. If it uses USI protocol, add -fUSI to the engine line or use the UCCI/USI checkbox in the load 1st/2nd engine window.
Download
XBoardSg_4.9.1a_OSX_Intel.dmg (65mb)
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For those who would like to try the latest changes in the hgm branch, you can try that here.
Download
XBoard_HGM_20171102_OSX_Intel.dmg (41mb)
Glad it's working!