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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.
image crate is the go-to tool for encoding/decoding images in Rust, but there's still plenty of work to be done. I've contributed a bit myself and it was quite pleasant. This is a very widely used crate, so any contributions will reach a lot of people.
https://github.com/rust-secure-code/safety-dance is always looking for contributors.
If you have interest in cryptography, take a look at RustCrypto: https://github.com/RustCrypto/meta/wiki/GSoC-Ideas
Not a GSOC project, but my game Sandbox is open to contributions! https://github.com/JMS55/sandbox
Maybe https://github.com/casbin/SummerOfCode2021#casbin-for-rust fits you?