Crossday Discuz! Board (or simply Discuz!) is an Internet forum developed by Comsenz Technology Ltd. It is built on the PHP scripting language, supporting MySQL and PostgreSQL database management systems. Discuz! is freeware. It is now widely used in China and Hong Kong, but has not been very popular in other countries/places due to lack of support for other languages. The long developed English version of 5.5.0 was never released to public.

It was modified from the well-famous discussion board XMB (forum).

Comsenz Technology Ltd