This page tries to list some nifty 3rd party solutions and products that can be interesting in combination with Big Sister. See also the 3rd party software list.
MessPC (English: PCMeasure) is a sophisticated but simply to deploy environmental sensors solution. The solution is especially interesting because it includes not only a number of different sensor types (temperature, humidity, generic analogue, smoke, ...) but also software and hardware parts that make the sensors available via SNMP and TCP/IP.
Big Sister talks to MessPC hardware via the btethernetbox plugin.