True open source surveillance does exist. It's called sousveillance, and uses the idea of distributing the task among many people, often in response to centralised surveillance. It's an interesting idea, especially in the context of a society like the UK's, where we are constantly spied on by CCTV cameras.
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What interested me here is that we have yet another seemingly specialised sector that is served by an open source application. This helps to give the lie to the by-now outdated idea that free software is only any good for basic infrastructural uses.
I must confess that what also caught my attention was the mention of X.10: I wonder how many people remember the infamous pop-under ads of yore? I was pleased to see that X.10's Web-site is still carrying the great graphic tradition those pop-unders established.