Abstract: Systems, methods, and software can be used to establish collaborative communications. In some aspects, a server receives a contact search request from an application of a first organization, the contact search request including contact information. The server determines a second organization, wherein the second organization is connected to the first organization to enable a user of the first organization to search a user directory of the second organization. The server determines a subset of the user directory of the second organization that can be searched by the user of the first organization. The server transmits, to the application of the second organization, the contact information and information of the determined subset of the user directory of the second organization. The server receives a contact search result from the application of the second organization. The serer transmits the received contact search result to the application of the first organization.

Abstract: Systems, methods, and software can be used to establish collaborative communications. In some aspects, a server receives a contact search request from an application of a first organization, the contact search request including contact information. The server determines a second organization, wherein the second organization is connected to the first organization to enable a user of the first organization to search a user directory of the second organization. The server determines a subset of the user directory of the second organization that can be searched by the user of the first organization. The server transmits, to the application of the second organization, the contact information and information of the determined subset of the user directory of the second organization. The server receives a contact search result from the application of the second organization. The serer transmits the received contact search result to the application of the first organization.

Abstract: A system and method for an event marketplace. The system comprises a first interface for communicating with a plurality of user devices; a second interface for communicating with a plurality of systems of service providers; a progressive accuracy module for at least iteratively computing a set of total cost estimations of the event based in part on an event specification and information retrieved from one or more of the plurality of systems of service providers; and a cost optimizer for providing at least an optimal set of service providers matching the event specification, wherein the optimal set of service providers is ranked by their total cost estimations, the total cost estimation is a function of at least a proposal for a respective service.