Motely is a fast Balatro seed searching library. It uses your CPU's 512-bit registers with SIMD to search 8 seeds at once per thread. It performs very well compared to current GPU-based Balatro seed searches (better on a lot of systems), and is the fastest general-purpose CPU-based searcher I know of.
Filters are written in JAML (Jimbo's Ante Markup Language). The C# engine owns the grammar: load a filter and it becomes a typed JamlConfig the search runs. Clauses can be one-line natural language ("Blueprint in ante 1") or structured documents — both are JAML.
Thank you so much to @OptimusPi for commissioning the development of this library. It started out as a personal project, and their support is what gave it the capabilities it has today.