Facebook for Business - Facebook Business gives the latest news, advertising tips, best practices and case studies to meet the business goals.
Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
Buzzstream - Build Relationships. Build Buzz. Web-based software that helps the world’s best marketers promote their products, services and content.
Fetchee - Fetchee is a free price tracking wish list app that works with all online stores worldwide.
Fomo - Fomo turns your site into the online equivalent of a busy store
Keepa - Price history charts and the option to be alerted on price drops for all Amazon sites.