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InfluxDB
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You can access it at the following address: https://capitalympics.com. Learning is available for registered users, but even without an account, you can find a lot of information about all the countries in the world. The site is translated into English, French, and Spanish, so feel free to ask if you'd like the addition of another language!
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.