There is also this:
http://www.midiclock.de/midiclock.php
Anyone any experience of this unit?
Nice device, but it’s for syncing hardware only.
The difference with the Sync Gen is that it syncs to audio pulses sent from the DAW/host (using a special plugin they include), and then outputs a stable clock to your hardware.
The device above only outputs MIDI clock from it’s own internal clock, so it would not help with syncing a host.