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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.
I like to practice with Codewars. They provide small exercises for every skill level and topic (also algorithm). After you solved an exercise, you see the solution of others and can rank them. The more exercises you solve, the higher you rank up
Have you checked out Advent of Code (https://adventofcode.com/)? There's quite a few years of problems, and you can try solving them in the language of your choice. And they do require a good knowledge of data structures and algorithms.
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.