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DuckDB (lightweight, non-JVM, many language bindings) supports querying from Iceberg now.

https://duckdb.org/docs/extensions/iceberg.html

You still need Spark to generate the Iceberg metadata though.

Snowflake is rolling out Iceberg support and not Delta support, I think that says a lot.

Bigquery too.

I guess you are referring to delta-rs (for Python in particular). An interesting factoid here is that Databricks started delta-rs, and other companies are now driving it forward - not Databricks. I guess it is not in Databricks interest to push the non JVM ecosystem. PyIceberg is catching up. Write support is almost there - https://github.com/apache/iceberg-python/pull/41

As I remember, delta-rs was started by Scribd, not by Databricks: https://youtu.be/2jgfpJD5D6U, https://youtu.be/scYz12UK-OY

I stand corrected, then.