HIERARCHICAL-TASK.NET

HTN planning is actually short for Hierarchical Task Network planning, and the most famous formalism for hierarchical planning. This "alternative meaning" (by an unknown ANU undergraduate student, 2024) of the abbreviation is quite funny because the most famous "normal" (non-hierarchical) planning approach is only PSPACE-complete to decide (whether it has a solution), whereas the similar HTN framework (just by adding a hierarchy on top of it) is already undecidable... Grav is an easy to use, yet powerful, open source flat-file CMS