Replacement for Isolator It seems that one of my all time favourite apps Isolator has been abandoned. While it still works, it hasn't been updated in forever, could use some customization features and it isn't ready for Yosemite.

Does anyone know of a great replacement for it, one that will have Yosemite support and be maintained onward?

Isolator Webpage — Still active.
http://willmore.eu/software/isolator/

I use this app every day, I've donated to the developer a few times and sent emails asking about it but to no avail, no responses or updates to the app. I wish they would just make it open source on github or something for someone else to pick it up if they don't want to continue with it.
Edit: Only just saw this comment by the OP. I will leave this answer up in case anyone finds it useful.



Try HazeOver. It does what Isolator did: Puts a dimmable layer over the screen except for the current window (or all windows of the current app).

It is a paid app, available on the Mac App Store. It has been updated for El Capitan and works for me without issues. The developer is responsive and has implemented a feature I personally requested.

You can activate HazeOver via the menu bar, a keyboard shortcut or AppleScript. I personally use a simple Alfred workflow to set the dim intensity.

Here is what it looks like (bottom left is HazeOver's preference window):