CleverDrawer

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This is an App Drawer that sorts contacts, apps and settings with your most likely launches at the top.

It does this by collecting statistics about what you launch when, and adapting the sort order according to this data.

To use CleverDrawer as your home screen, check the "Home Button Launcher" box in the options menu. Then go to (System) Settings / Apps / Advanced / Default apps / Home app and check CleverDrawer there.

Source code available: https://github.com/walles/cleverdrawer