Windowed interface is a pain in the ass.
It’s not because it doesn’t do anything, but because it does everything and it does it in a freestyle, manual way that gives the headache, it even creates an entire category of window resizing management app and we have a slew of them — mostly paid with prices between $1.99 to $14 — at the time of this writing.
But I also found this app.
It’s a fork of an original abandonware, and the latest available build is dated Nov 2010 (version 1.5).
It’s a low-memory usage, menubar-based background app (removable icon), supports 8 different window mode including center & fullscreen maximizing for every active OS X window. On version 1.5, though, the app is still yet to support restoring windows to their original size[1. The maintainer seemed to have implemented this feature and will make it available on the next release.] like some of its paid counterpart, but at $0, with enough window resizing scenario possible (I’m home with the side-by-side left-right scheme), keyboard shortcuts & removable menubar icon, and a reasonable roadmap, I’m not even gonna complain.
And I think the Fifth Gear-style icon was cute.