The website's not great IMO (the nav bar doesn't seem to work at all on my machine) but about half way down https://www.open-xchange.com/products/ox-app-suite-c

The website's not great IMO (the nav bar doesn't seem to work at all on my machine) but about half way down https://www.open-xchange.com/products/ox-app-suite-cloud https://www.open-xchange.com/products/ox-app-suite-cloud is a grid showing the capabilities, incl calendar, doc editing & storage and tasks, on top of email.