Anyma uDMX

Anyma uDMX comes with a open firmware, which is rare. The USB communication is handled by the firmware instead of a separate chip. This must be very cheap to build!

Hardware:

• From USB to DMX (one way DMX)
• All the electronics is inside the XLR - two smd IC's: An AVR microcontroller and a RS485 driver
• The DMX data is buffered and the transmission is timed by the microcontroller
• USB powered
• No galvanic isolation

Software:

• An external object for Max/MSP (OSX)
• A console app for Linux/OSX
• MIDI control via a OSX app
• There's an example how to control the console app from php scripts (seems easy)
• Gratis firmware. The DMX part is GPL, the USB part from Objective Development is "open" but all changes belongs to them.

Anyma uDMX
Objective Development's "AVR-USB