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Re:Amethyst – A tiling window manager for OS X by tjl on Thursday December 18, 2014 @03:00PM (#8769328)
Unfortunately, the lead developer has decided to work on a closed-source alternative to Mjolnir so a new fork has been made.
Re:Amethyst – A tiling window manager for OS X by 0942v8653 on Thursday December 18, 2014 @06:33PM (#8770319)
It looks like he thought about merging them for at least a few minutes[0].

[0]: https://botbot.me/freenode/hammerspoon/2014-11-25/?msg=26223...

Re:Amethyst – A tiling window manager for OS X by cmsj on Thursday December 18, 2014 @03:56PM (#8769566)
said fork is Hammerspoon - http://www.hammerspoon.org/