1-wire products are provided through Dallas Semiconductor . Dallas is the maker of the iButton semiconducor chip and these iButtons are used throughout the weather station setup. A company in Mexico, AAG , is making the original experimenter's kit available very inexpensively. Texas Weather Instruments makes their own version of the 1-wire weather station.
Additional sensors are also available from Point Six .
1-wire weather software collects data, displays it through UDP to other workstations on the local network. This excellent software was provided by Arne Henriksen of Norway.