opnode (open node) is the generic name of all network controllers developed by http://www.opnode.org. At this moment, the project is formed by two main hardware designs and two applications:
The opn-one controller with the opn-one application is a web-based network controller that works as 1-Wire master. It provides xAP and xPL interfaces.
The opn-232 controller with the opn-x10 application is similar to opn-one except for the external interface. opn-232 provides a RS232 port instead of 1-Wire to communicate with any external device with serial interface. The opn-x10 application can control a CM11 X10 interface, forming an excellent X10 embedded network controller with web and xAP. ... read more
Source files, schematics, web pages, binaries and images are now downloadable from SourceForge.
You can follow the evolution of this project on http://www.opnode.org. There you'll find a description about the project and a discussion board for users and developers.