Use sqlcmd [!INCLUDE SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics PDW FabricSQLDB] sqlcmd is a command-line utility for ad hoc, interactive execution of ...

This is a bit hacky and searches for repos containing the string .duckdb_extension, so it's not 100% reliable. Extensions that are not included in the DuckDB core (and are not listed in the output ...