Python bindings for libsensors.so from the lm-sensors project via ctypes. Supports API version 4, i.e. libsensors version 3.x. Hasn't been worked on in a couple of years. Uses Python's ctypes library to interface with sensors.so.
A page that talks about passive and active sonar sensors. Security uses, especially the seismics. Links to other books and DoD video footage. I think this would be useful for training as well as surveillance applications.
The github repo of work pertaining to IoT communications and protocols over XMPP instead of other methods or networks. One advantage is that, by using p2p XMPP, devices could communicate with each other.
github repo for a fairly simple daemon that polls the system's sensors. When enough fail it runs a script in response. Can be used as a dead man's switch. FOSS Written in C. If you can write a sensor of some kind that monitors for something and emits a zero if yes or good, or not-zero if no or fail, you can probably use swatd for it.