Icinga Web 2 is the next generation open source monitoring web interface, framework and command-line interface developed by the Icinga Project, supporting Icinga 2, Icinga Core and any other monitoring backend compatible with the IDO database.
For installing Icinga Web 2 please read doc/02-Installation.md.
If you come across problems at some time, the community support channels are good places to ask for advice from other users and give some in return.
For status updates check the Icinga website and the Icinga Web 2 development roadmap.