Python SDK for the VGI (Vector Gateway Interface) protocol — host DuckDB scalar, table, aggregate, and table-in-out functions in an external worker over Arrow IPC.
Type-safe SQL query builder like QueryDSL or JOOQ in Java or Linq in .Net for TypeScript with MariaDB, MySql, Oracle, PostgreSql, Sqlite and SqlServer support.
A library to help with analyzing a database. It then make suggestions for improvement or can apply them automatically if you like to live dangerously. For the most part it reports recent expensive queries, missing indexes, overlapping indexes, and unused indexes. However it can be expanded upon to add your own analyzer.