This is why forums are annoying. It starts with a legitimate question. But for years anyone who follows it will only find useless commentary and will waste work time trying to find the efficient solution that should've been the only answer
Not to mention getting high-ranking search results for threads that were bumped back to the top but are years and years old and therefore completely outdated.
I have found the best utility for the MAC to emulate the Windows split window option is an application called Cinch. You can download it from the Apple Store. It runs in the top toolbar as a dotted line box looking icon. When you slam the window to the left, it does a half left screen. Same thing to the right. If you do it to the top it maximizes the application window. If you want to license it, the Cinch utility is $7.00. Well worth it.
Try turning on App Expose in the System Preferences. I think in older versions of OS X it did this with F8, on my Macbook it was turned off but the default gesture was swipe down with three fingers. I meant a sofware what gives only space what the Window need. Read the image. I don't want full maximize. I want to give just enough space to windows.
Anyone who says the "snap" feature is useless is probably just a Mac snob. I have a MacBook Pro but as a student I use Windows 7 all the time on campus computers. The snap feature is the best thing to happen to studying since powerpoint. Apple needs to pick up their game and stop coming out with useless updates that make no real change (iPhone 4 and 5 are almost the exact same phone). I want the snap feature on my Mac!!!
Great way to endear yourself and your opinion to anyone¡
SHUT UP AND GO AWAY.
I have traditionally been a PC guy however have been forced to use a MAC for work. I am a network engineer and software developer by occupation. I have approached MAC OS objectively, they are both just an Operating System (OS). They both can do all the same things anyone would expect out of an OS and "for the most part" it is a matter of personal preference and opinion for 99% of the world to use a MAC or PC. I have identified pros and cons of both. Honestly the window snapping feature of Windows 7 is something I use all the time. I often find myself looking at router output in multiple windows or comparing code side by side. The snap feature allows me to quickly move windows around multiple wide screen monitors using only a hot key "Windows Key + Arrow", moving the mouse around is too slow. I found the Cinch application for MAC that sort of does this however I am all about hot key's. When your typing fast and spend all day typing; dragging the mouse around is too slow, so if anyone knows of anything like this for MAC I am still on the hunt.
NetEng - I also work on two platforms, but I'm in the Education field.
I found this article that lists several options for snapping windows in the Mac OS.
I just installed ShiftIt because it's free, and so far-so good...but, it's literally been two minutes. :-)