inquirex

https://github.com/inquirex/inquirex

Inquirex lets you define multi-step questionnaires as directed graphs with conditional branching, using a conversational DSL (ask, say, mention) and an AST-based rule system (contains, equals, greater_than, all, any). The engine walks the graph, collects structured answers, and serializes everything to JSON — making it the ideal backbone for cross-platform intake forms where the frontend is a chat widget, a terminal, or a mobile app. Framework-agnostic, zero dependencies, thread-safe immutable definitions.