Amazon on Thursday launched an online service for collaborating on work projects in a challenge to tech titan Google. Zocalo is being billed as a secure, managed venue for storing, sharing and amassing feedback on documents, spreadsheets, presentations, Web pages, and other digital tools typically used to get modern day jobs done. The Internet retail giant added Zocalo to its menu of Amazon Web Services (AWS). Customers have told us that theyre fed up with the cost, complexity, and performance of their existing old guard enterprise document and collaboration management tools, Zocalo general manager Noah Eisner said in a release.