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I use ShiftIt (https://github.com/fikovnik/ShiftIt), which is similar, as I recall, but free. Has keyboard shortcuts. I use it for pretty much all my windows.

(A few years ago, before I started using OS X, I wrote something similar for Windows, for use with AutoHotKey: https://github.com/tom-seddon/align_window2)

Yes - have been using shiftit for years now and love it.

I didn't even need to program or customize any hot-keys since everything I want to do (full screen, half screen, quarter screen) is already built into a hotkey.

I use SizeUp as well. One really nice feature is that there are keyboard shortcuts to move windows from one monitor to another. I tried some other OSX window managers but they were buggy, SizeUp ended up working the best.

This one? http://www.irradiatedsoftware.com/sizeup/ apparently 12.99usd

Yeah, I had this problem a long time ago. Installed SizeUp + Divvy, but I've just used SizeUp and haven't looked back.

I know that there are loads of universal window managers, but I wanted a one with a terminal API ;)

+1 for SizeUp.