A popular Linux distribution, produced by a company that has committed to making all its code open source.
Not incredibly popular among LUG members, although there are a fair few who use it. Red Hat is the main distribution of choice among the corporate users of Linux, and is also the distribution which IBM resells with its Linux products.
Red Hat uses the rpm (Red Hat Package Manager) tool to manage application installation, which is very popular. There are several distributions that use rpm, such as SuSE, and Mandrake, which is based closely on Red Hat.