The Jack-in-the-Net Architecture (Ja-Net) is a biologically-inspired approach to design adaptive network applications in large-scale networks. In Ja-Net, a network application is dynamically created from a collection of autonomous components called cyber- entities. Cyber-entities first establish relationships with other cyber-entities and collectively provide an application through interacting or collaborating with relationship partners. Strength of a relationship is the measure for the usefulness of the partner and adjusted based on the level of satisfaction indicated by a user who received an application. As time progresses, cyber-entities self-organize based on strong relationships and useful applications that users prefer emerge. We implemented Ja-Net platform software and cyber-entities to verify how popular applications (i.e., applications that users prefer) are created in Ja-Net.