Keywords Everywhere - Free browser add-on for keyword volume, CPC & competition
Free Twitter RSS Feed Generator - Convert Twitter lists, hashtags & searches into RSS feeds
Nooshub - RSS Reader with AI to cluster similar content
Winds - Open source & beautiful RSS reader
Pine.blog - The social combo of an RSS feed reader and blogging app
Cappuccino - Cappuccino is a framework which makes it easy to create advanced web apps.