reasoning Tools

PageIndex is an open-source document indexing system designed for vectorless, reasoning-based retrieval-augmented generation (RAG). It solves the problem of getting verifiable, context-rich answers from complex documents by using fast tree indexing instead of traditional vector search. It's built for developers and teams who need precision, traceability, and efficient context retrieval for their AI applications.

Semantica is an open-source, graph-native infrastructure that provides AI systems with structured context, causal reasoning, and full decision provenance. It solves critical production AI failures like data silos and black-box decisions by making AI explainable, traceable, and accountable by design. It's built for developers and enterprises using AI agents, LangGraph, CrewAI, LlamaIndex, and other frameworks who need trust and auditability in production.