· MediaWiki ·
Someone asked about how to send an email if a MediaWiki page hasn't been updated in a year, and it reminded me of an extension I wrote in 2013 that was for just that sort of thing. It was quite cool, for the year or so we used it.
It was on a wiki that stored information about fleet maintenance and tools and things (documentation sorts of stuff mostly), and people wanted to be reminded of pages that they needed to review on a regular basis. It could target things quite well, so people wouldn't get emails if other people had already done the review, and I think that helped with the response rate to the emails actually being quite high (although maybe that was just because the whole project was closed down after a year and people didn't have time to get sick of it).