OPEN is an innovative platform that connects passionate volunteers with active biodiversity observatories, facilitating participation in citizen science across France. With a community of over 75,000 participants and 203 observatories, OPEN promotes meaningful engagement in the observation and protection of nature. The platform offers a wide array of resources and tools tailored for both casual observers and professional naturalists, enhancing the collective understanding of biodiversity.

Participants can immerse themselves in various themes, from urban and agricultural biodiversity to marine environments, engaging in initiatives like the inventory of remarkable trees in Isère and the "Opération Papillons" project aimed at butterfly conservation. OPEN’s commitment to biodiversity is clear through its diverse range of programs that invite everyone, regardless of prior knowledge, to contribute to vital research and advocacy efforts. By joining OPEN, users not only enrich their understanding of the natural world but also play a crucial role in its preservation.