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ErgoAI is a rule-based enterprise-grade knowledge representation and reasoning (KRR) system for building knowledge-rich applications. It is highly expressive and feature-full, and yet is easy to learn and use. ErgoAI was opensourced in Spring 2023 and is now a replacement for Flora-2.
Flora-2 was an open-source version of ErgoAI when the latter was proprietary. Capability-wise, it lacks the enterprise features of ErgoAI and is now deprecated.
XSB is a sophisticated logic reasoner used by Ergo as a base inference engine.
ErgoAI Frequently Asked Questions (FAQ)
ErgoAI documentation (manuals, tutorials)

Current projects in flora-2?

Paul Payne