Another project watchers might find interesting is the top post on r/Excel, where someone made a video player in Excel because his machine was completely locked down.
My favourite (ab)use of Excel, which is already on your list, is using it for HDR photography[0].
While I'd never use it for day-to-day anything, things like this are a really interesting way to show how things like HDR photography actually work. Excel can be very approachable for stuff like this.
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[ 2.9 ms ] story [ 30.3 ms ] thread(Gwern has a whole list of accidentally/surprisingly turing-complete things at [2])
1. https://www.youtube.com/watch?v=uNjxe8ShM-8
2. https://www.gwern.net/Turing-complete
Another project watchers might find interesting is the top post on r/Excel, where someone made a video player in Excel because his machine was completely locked down.
https://old.reddit.com/r/excel/comments/2jtd2f/worked_on_a_c...
https://www.youtube.com/playlist?list=PLjIYRqpIFecpDSXqCOddU...
While I'd never use it for day-to-day anything, things like this are a really interesting way to show how things like HDR photography actually work. Excel can be very approachable for stuff like this.
[0] https://www.youtube.com/watch?v=bkQJdaGGVM8