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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.
It depends on what type of project you're looking for/what type of development you're studying, but if it's web - https://apivault.dev/ is a site someone posted here a while ago that lists and categorizes a bunch of free APIs. I'd find a category you're interested in, and see if there are any APIs that can inspire a project idea around them. Because like the other comment said, if it's not something you're passionate about, it's going to be hard to force yourself to work on it to completion if you're doing this on your own time.
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.