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Depending on the use case, temp tables (added in https://github.com/GlareDB/glaredb/pull/1089) might work as a form of persisting query data. These tables are dropped when the session closes though, and so usefulness might be limited.
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InfluxDB
InfluxDB high-performance time series database. Collect, organize, and act on massive volumes of high-resolution data to power real-time intelligent systems.
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Apache Arrow is a pretty common memory structure these days. Datafusion is an open query engine built in Rust started by Andy Grove.
NOTE:
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Hence, a higher number means a more popular project.