We are showing and discussing an approach to participatory activities in planning and in e-governance, based on a webgis and collaborative web-environment. We previously(UDMS 2006) defined an architecture for an open content system for planning processes and presented its protptype of partial implementation through a participatory planning web-system. We have then experimented with such web application to support different social typologies of formal and informal participatory contexts. In this paper we are reporting on the mentioned experimentations and are presenting the perspectives of further development of the project aiming at integrating webgis and collaborative web environments in a unique open system.