tangent and pretty specific, but does someone know if there is something like a diy version of Enttec's dmxis? (that is, something like a midi to dmx converter)
I don't know about the software, but as for a DIY hardware solution, you can just connect a USB-DMX interface (like the Enttec DMX USB Pro) and a USB-MIDI device to a laptop and "just" have to code something to translate MIDI input to DMX output. Or use an Arduino, an RS-485 module and a few other components, that's what I once did.