Documents encapsulate the knowledge and decisions that information workers use to accomplish their goals. Collaboration -- with peers, customers, partners, and trusted external experts -- is essential in mobile, distributed, and customer-focused enterprises. End user self-provisioning of consumer-oriented tools, often with free or freemium pricing options, has caused angst among technology and security managers. This report highlights a range of products to help address the collaboration challenge. This report is an update to the 2013 document collaboration vendor landscape report and reflects the next step in maturation of a fragmented and crowded market.