SparkFin - Learn the markets for free, profit forever.
Tasker - Tasker is an application for Android which performs Tasks (sets of Actions) based on Contexts...
Robinhood - Free stock trading service.
AutomateIt - Automate Your Android!
StockTwits - A financial communications platform for the investing community.
Locale - Locale helps content owners and translators work together, so Rails developers are free to write more code