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Microcontroller (AVR) based standalone digital light controllers ("dimmers"). The "Diamond" series supports 20 channels (TRIAC, FET, 0-10V, relay) with automatic fading, 20 scenes, 21 timers, IR remote, LCD, DMX-512 interface, global standby & more.
Userspace Driver and application to control DMX-512 devices through Velleman's K8062 kit under Linux.
This is only a proof of concept, I never found the time to go further (a full kernel driver using either a block device or a /proc file)