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adventofcode
Advent of Code solutions of 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022 and 2023 in Scala (by sim642)
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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.
The most well known is the Eric Wastl's Advent of Code it will start dropping daily challenges at midnight EST December 1. The puzzles are language agnostic. You can solve them in whatever language you want.
A project that encourages developers to send a PR to an open source project every day for 24 days. They have many featured projects. 24 pull requests
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.