Status and Resources

Classical OpenCog Repositories

Several opencog/* repositories continue to receive updates from original OpenCog contributors — most notably Linas Vepstas, historically the project's top contributor. This ongoing work independently maintains the classical OpenCog stack, but is not coordinated with the Hyperon project.

• link-grammar — v5.13.0, independently maintained, multi-language support
• cogserver — v3.4.1, independently maintained
• cogutil — v2.2.1, required dependency for all legacy C++ projects
• atomspace — Mature classical implementation, independently maintained
• learn — Neuro-symbolic structure learning, independently maintained

Legacy Repositories Archived/Superseded

• opencog/opencog — Core cognitive server framework (archived ~2021)
• opencog/ure — Unified Rule Engine (superseded by MeTTa chaining)
• opencog/pln — C++/Scheme PLN (superseded by MeTTa PLN)
• opencog/moses — C++ MOSES (superseded by metta-moses)
• opencog/attention — C++ ECAN (superseded by metta-attention)
• opencog/relex — Java dependency extractor (unmaintained since ~2016)

Primary Sources

• Goertzel, B., Pennachin, C., Geisweiller, N. (2012). Building Better Minds. See BBM Publication Map.
• Goertzel, B., Pennachin, C., Geisweiller, N. (2014). Engineering General Intelligence Vol 1–2. Atlantis Press.
• Goertzel, B. (2006). The Hidden Pattern. Brown Walker Press.
• Goertzel, B. et al. (2023). OpenCog Hyperon: A Framework for AGI at the Human Level and Beyond.
• Goertzel, B. (2025). Hyperon for AGI⇒ASI Whitepaper. See Whitepaper Publication Map.