The best alternatives to Stay for OS X are Hot Shots 2, Workspaces, and Split Screen Ultimate. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of Stay for OS X?
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Workspaces is a beautiful, minimal app that gives me an organized one-click option for all those projects along with the apps and urls that correspond with each. Apptorium's support is top-notch as well.