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Worth mentioning the Iodine project which allows for arbitrary IPv4 to be tunnelled over DNS, which can be useful on a few different restrictive networks.
(I also like the naming pun; DNS running on port 53 with Iodine having the atomic number 53.)
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For a variation of this technique see this handy golang differential-privacy metrics collection library that uses DNS: https://github.com/Jigsaw-Code/choir
Currently used by the Jigsaw group at Google to collect metrics from behind censoring ISPs.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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This is also possible to do over the browser (just one-way communication, unfortunately) using dns-prefetch tags: