Currently recommended BasiliskII build for MacOSX/OSX/macOS:

SDL2 port, 11 July 2018, 64-bit only from github.com/kanjitalk755/macemu source
For Intel Mac, MacOSX 10.7 (Lion) through macOS 10.14 (Mojave)
Download: http://ronaldpr.home.xs4all.nl/basilisk ... 180711.zip
If you have an existing BasiliskII setup, you can simply replace the application with the new application.
If you use the BasiliskII_keycodes file, you will also need to replace that file with the new one that is included in the download.

In this SDL2 port the window full-screen toggle (Ctrl-Return) works very smoothly and full-screen mode is fully compatible with Mission Control and Spaces.

Older builds
A variety of older builds can be found in the post below.

BasiliskII Disk Image Chooser (with thanks to our member "emendelson")
Selecting and managing disk image files can be done in the volumes list in BasiliskIIGUI, but this AppleScript application is easier to use for that purpose.
Originally introduced in this topic: http://www.emaculation.com/forum/viewto ... f=6&t=5455
Download: http://www.columbia.edu/~em36/EmulatorD ... hooser.zip

Setup manuals:

This setup manual in E-maculation wiki explains how to set up BasiliskII with System 7.5.3:
Setup manual: http://www.emaculation.com/doku.php/bas ... _osx_setup

This guide describes printing in SheepShaver and BasiliskII:
http://www.emaculation.com/doku.php/she ... k_printing

This guide describes setting up AppleTalk for Basilisk (OS X):
http://www.emaculation.com/doku.php/app ... heepshaver

When I posted my March 2014 build I hoped to bring some order in all the various BasiliskII builds floating around. But it appeared that some games suffer from extreme stuttering in that build. Those games do run smoothly in builds by vasi, though.

Discussion in this topic: http://www.emaculation.com/forum/viewto ... f=6&t=8297

Here are all the builds made available publicly between 2009 and 2014:

1. Compiled from cebix/macemu source:

October 2009 UB build by me (10.4 and up), with PPC-only GUI included:
http://www.xs4all.nl/~ronaldpr/basilisk ... 091004.zip

October 2011 builds by vasi (10.6 and up, 32-bit):
BasiliskII: https://github.com/downloads/vasi/b2gui ... I-10.6.zip
BasiliskIIGUI: https://github.com/downloads/vasi/b2gui ... I-10.6.zip

March 2013 builds by vasi (10.6 and up, 32-bit, with sparsebundle support):
BasiliskII: https://www.dropbox.com/sh/krq4jq9dsrem ... II.app.zip
BasiliskIIGUI: https://www.dropbox.com/sh/krq4jq9dsrem ... UI.app.zip

March 2014 build by me (10.6 and up, 32-bit, with sparsebundle, cursor grabbing toggle, and window-fullscreen toggle support) now with October 2011 GUI included.
http://www.xs4all.nl/~ronaldpr/basilisk ... 140301.zip


2. Compiled from dsumorok/macemu source:

July 2013 builds by Cat_7 with with special support for simplified AppleTalk setup on wired networks. These builds are for 10.8 and up, are 64-bit, and have sparsebundle, cursor grabbing toggle, window-fullscreen toggle support. See topic: http://www.emaculation.com/forum/viewto ... f=6&t=8067
Cat_7 notes: These builds do not stem from the official source code repository and will most likely not be updated when the official source code changes.

01-03-2014: Posted the new March 1, 2014 build.
02-03-2014: Replaced the included GUI in the download. (The originally included March 2013 GUI erroneously depends on external X11-related files.)
02-03-2014: Added list of all publicly available builds since 2009.
03-03-2014: Added link to current discussion.
10-08-2016: Removed outdated comment that the 2013 GUI build will only run with X11/XQuartz installed.

Posted the 64-bit SDL2 port, July 2018 build.