[bobetter]

One is the SeaMate from Mølgaard Netcom (an danish company)
<http://www.molgaard.dk/index.php?id=6&jump=1&action=marine>
The other one is the "Quickie" I read about on the "more WiFi" thread on MacSailing.net. It refers to
<http://www.quickertek.com/marine_menu.php>
I wouldn't wonder if there were more, as the WLAN interface is not very challenging to connect from Macs.

No Mac drivers for the SeaMate system and I don't think it's function is what you're looking for, but maybe I'm misunderstanding you. The Quickie rig isn't anything NMEA-specific.
I think the issue being discussed here is getting NMEA and/or Seatalk data into a Mac. Numerous methods have been described above. On my boat, I have a ShipModul Bluetooth multiplexer that will accept NMEA, SeaTalk and AIS from the boat and NMEA generated by MacENC for Autopilot function. In terms of utilizing a WLAN, I can then create a network with the Mac and broadcast the entire data stream (wirelessly, if desired) utilizing the TCP/IP capability of MacENC. In terms of the actual instrumentation branding, Raymarine stuff works just fine, if your needs are for stuff that has more versatility, Nexus and B&G both make equipment that is perhaps more accurate and more agile in terms of NMEA processing.