You can download the Gallery's games and play them on your own computer.
The current version of the Early Roguelike Collection is 2016.06. Release notes.
Choose this if you want to build the games yourself, or investigate how they work.
Packages may appear someday.
Mac OS X
This build is a few years old. It doesn't include Advanced Rogue 7, XRogue, or recent bug fixes. I don't currently have access to any Apple devices, so I have little hope of being able to provide updates for this platform.
Download the current build for 64-bit Windows 8 or newer.
If you find any problems, report them on Bitbucket.