#tree-structure

The multi-level select field lets you pick one or multiple options from a list that is neatly organized into different levels.

Laravel package for managing taxonomies, categories, tags, and hierarchical data structures. The package implements a nested-set model for optimal query performance and provides a rich API for organizing and querying hierarchical data in Laravel applications.

Easily and efficiently make your ActiveRecord models support hierarchies

Gotree: a set of command line tools and an API to manipulate phylogenetic trees.