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dns.toys
A DNS server that offers useful utilities and services over the DNS protocol. Weather, world time, unit conversion etc.
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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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bunny1
bunny1 is a tool that lets you write smart bookmarks in python and then share them across all your browsers and with a group of people or the whole world. It was developed at Facebook and is widely used there.
You can also use iodine (https://github.com/yarrick/iodine/) to tunnel IPv4 data through DNS (useful e.g. when on a captive portal network that doesn't block DNS requests). Performance isn't great obviously, but the concept is fascinating nonetheless.
Shameless plug:
Since I was in the process of implementing plugins for kittendns (https://github.com/fusion/kittendns), I felt I should at least implement the timezone toy as proof of concept. This forced me to implement 'fetch' in the javascript plugin so, I guess, everyone wins :)