NOAH https://www.ijcai.org/Proceedings/75/Papers/028.pdf
Nonlin http://www.aiai.ed.ac.uk/project/nonlin/
David E. Wilkins. "SIPE-2: System for Interactive Planning and Execution". Artificial Intelligence Center. SRI International. Retrieved 2013-06-13. http://www.ai.sri.com/~sipe/
O-Plan http://www.aiai.ed.ac.uk/project/oplan/
UMCP http://www.cs.umd.edu/projects/plus/umcp/
I-X/I-Plan http://www.aiai.ed.ac.uk/project/ix/
SHOP2 http://www.cs.umd.edu/projects/shop/
PANDA https://www.uni-ulm.de/en/in/ki/research/software/panda/
HTNPlan-P http://www.cs.toronto.edu/kr/publications/1242050782_Sohrabi-IJCAI09.pdf
Erol, Kutluhan; Hendler, James; Nau, Dana S. (1996). "Complexity results for htn planning" (PDF). Annals of Mathematics and Artificial Intelligence. 18. Springer: 69–93. Retrieved 8 February 2015. /wiki/Dana_S._Nau
Alford, Ron; Bercher, Pascal; Aha, David (June 2015). Tight Bounds for HTN Planning (PDF). Proceedings of the 25th International Conference on Automated Planning and Scheduling (ICAPS). Retrieved 8 February 2015.[permanent dead link] http://www.volus.net/publications/alford2015tight.pdf
Alford, Ron; Kuter, Ugur; Nau, Dana S. (July 2009). Translating HTNs to PDDL: A small amount of domain knowledge can go a long way (PDF). Twenty-First International Joint Conference on Artificial Intelligence (IJCAI). Retrieved 8 February 2015. /wiki/Dana_S._Nau