Snapping windows for mac?

There is a feature on linux that I just love, and now that I'm using a mac I really miss this feature. I linux, you can snap the windows to the sides, top bottom, and to other windows. There was also a program for windows that let you do this, called allsnap. http://ivanheckman.com/allsnap/

Is there any way to do this on mac? or a 3rd party program to do it?
Or atleast something that stops windows from going beyond the edge on the sides and bottom just like it does when you try to move a window up.

Thanks,
-Joseph

 

Not exactly what I was looking for but helpful.
thanks.