The major problems of agent organizations in an open multi-agent environment have been considered. The concept and principles of a platform for the open multi-agent environment, methods of modeling of agent organizations using XMPP and HTTP protocols are described. It is shown that the XMPP protocol provides a natural way to implement the dynamic nature of the organizations. The architecture and base components of the eSocialGRIDs platform for the distributed open multi-agent environment have been developed.