mod_throttle: Bandwidth & Request Throttling for Apache 1.3

This Apache module is intended to reduce the load on your server & bandwidth generated by popular virtual hosts, directories, locations, or users according to supported polices (see below) that decide when to delay or refuse requests. Also mod_throttle can track and throttle incoming connections by IP address or by authenticated remote user.

Every request now passes through four levels of throttling, which are: by client's IP address (ThrottleClientIP), by authenticated remote user name (ThrottleRemoteUser), by local user ID (ThrottleUser), and by directory, location, virtual host, or server (ThrottlePolicy).

Download/more info: http://www.snert.com/Software/mod_throttle/

See also: TheRobotProblem, IssueNo0351?