It changes from user to user. I would include these:
Falcon Pro. The best Twitter client for Android. Only thing lacking is real push notifications.
Nova Launcher Prime or other launcher if you want more customizable options than the stock one.
EZ Weather. One of the best interfaces, free, no ads and very good looking widgets.
Notifications Toggle. At least until we get 4.2.2, you can put nice toggles on the notification shade. Other worth mentioning is Power Togggles.
Press or other RSS Reader, specially if you are using a third-party launcher or don't like BlinkFeed.
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