Guard::Treetop automatically compiles your treetop grammars

This library can be used to build a tree structure, and render or print it like an ASCII graph. It can be used to implement a directory tree viewer or something like that.

Trie-like, prefix-tree data structures. First, a prefix-tree based on Arrays, which differs from a traditional trie, which maps strings to values. Second, a more general prefix-tree data structure that works for any type of keys, provided those keys can be transformed to and from an array. Both ...

Task Tree is a CLI tool that helps you keep track of your tasks in a tree structure

A Ruby implementation of the Centered Interval Tree data structure. See also: http://en.wikipedia.org/wiki/Interval_tree

Sane ActiveRecord tree builder

Binary Tree based bracketing system

SortableTree provides sorting of lists and hierarchies from ActiveAdmin index views.

DataMapper plugin allowing the creation of tree structures from data models

This is a ruby gem that provides drop in replacement for acts_as_tree but makes use of SQL recursive statement. Be sure to have a DBMS that supports recursive queries when using this gem (e.g. PostgreSQL or SQLite).

A Ruby implementation of the Augmented Interval Tree data structure. See also: http://en.wikipedia.org/wiki/Interval_tree

The Ruby Language Toolkit provides classes for creating context-free grammars, lexers, parsers, and abstract syntax trees.

A Ruby Gem implementation of Bitcoin HD Wallets

Tree data structure for storing segments. It allows querying which of the stored segments contain a given point.

Quick #rebuild! method implementation for closure_tree on PostgreSQL.

This gem provides the jQuery plugin jquery-treeview for your Rails 3.1 application.

Model gets: root, siblings, ancestors, descendants and other methods for tree navigation

Fully featured tree implementation for Mongoid using materialized paths and relative associations. Featuring Depth and Breadth first search.

acts_as_tree as a gem

Generate CCN Treemap based on saikuro analysis