I don't know one. But I for the longest time played with the notion of getting an arduino with an ethernet module connected to the amiga serial interface.
Then the next step would be to write a sana2 device wich could talk to it.
But neither my skills or time was sufficient to get the job done.
Here is some info on the Arduino:
Arduino homepage, you can program it with c/c++. And communicate with it through serial port from your computer.
Arduino Ethernet shield(
1,
2), route serial talk from computer via arduino to this module...
That's where it started for me, I initially bought my Arduino to play with lcd displays and such with it. Maybe make it into a build server alarm. Blink and such when the CI server detects a broken build.
But then I saw this product:
Ethernet Micro Web DeviceThat's a full TCP/IP stack and small webserver which connects to a paralell port. It cannot be used with an amiga because it's an incompatible parallell port power setup.
But redesign that either for the parallell port, or serial port. Implement a sana2 device, or bedsocket library, and you're set. It's a lot of work. But you're standing on the shoulders of gigants who've come before you.