Gadgetbridge - A free and cloudless replacement for your gadget vendors' closed source Android applications.
Tasker - Tasker is an application for Android which performs Tasks (sets of Actions) based on Contexts...
fitbit - The Fitbit mobile app is for people who use Fitbit fitness trackers to keep track of their activity goals, food plans, and other fitness related things. Read more about fitbit.
AutomateIt - Automate Your Android!
Strava - The #1 app for runners and cyclists
Locale - Locale helps content owners and translators work together, so Rails developers are free to write more code