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InfluxDB
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
State of the Haskell Ecosystem
For low-level embedded, you have Copilot!
I'm not convinced so far that the Haskell implementations I've seen like https://github.com/GaloisInc/HaNS/blob/master/src/Hans/Tcp/Input.hs offer improvement.
For the last question, also in the small games line, OP you could try to make a Haskell Tiny Game : https://github.com/haskell-game/tiny-games-hs .
NOTE:
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Hence, a higher number means a more popular project.