trustfall
A query engine for any combination of data sources
...The system is inspired by GraphQL-like paradigms, enabling expressive and composable queries that can traverse relationships across different data domains seamlessly. Trustfall operates by parsing, compiling, and executing queries through adapters that connect to specific data sources, making it highly modular and adaptable to new environments. It can run entirely client-side through WebAssembly or in traditional server-client architectures, offering flexibility in deployment scenarios. The engine is particularly powerful for cross-source querying, where data from multiple APIs or formats must be combined into a single result set.