UpEffect - Crowdfunding for social good products
Gone - An ephemeral to-do list
Tickr - TICKR is GTK-based RSS READER application which displays RSS FEEDS in a TICKER bar on your desktop.
Streaks - The to-do list that helps you form good habits.
Creddon - Tweet for a cause and a sponsor will donate $1 to charity
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.