Icinga Web 2 is monitoring software that was released on June 23, 2016 to address limitations of previous versions like lack of extensibility, user management, and mobile support. It has a lightweight architecture that is easy to set up and use across devices, with features like role-based access control, support for Icinga 1.x and 2.x, and basic APIs. The developers' vision is to continue expanding its module and API capabilities.