Multiroot_tree has some of the functions of a typical tree data structure. It can be used to model process, dependencies, and prerequisites.

Guard::Treetop automatically compiles your treetop grammars

Line-tree parses indented lines of text and returns an array representing a tree structure.

This gem implements a rooted, ordered tree, with a focus on easy iteration over nodes and access to basic tree properties. Moved to ---> "rooted".

This gem implements a rooted, ordered tree, with a focus on easy iteration over nodes and access to basic tree properties. Formerly known as "rooted_tree".

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

This library allows you to input a tree structure (node with children), a context, and comparators then outputs you the matching tree structure.

Hitsuji is a library that implements a tree data structure, where each node is represented by a value, points to other values, or performs a function on some values. When the tree is updated, the inputs to the functions will change, hence changing the outputs, eventually propagating the u...

A plugin for DataMapper that allows model objects to be a part of a heirarchal tree structure. Based on the acts_as_tree plugin for ActiveRecord.

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.

Make any Rails model treeable. Any model is Treeable if it has parent chuld relation with itself

Sane ActiveRecord tree builder

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

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

Binary Tree based bracketing system

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).

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

A Ruby Gem implementation of Bitcoin HD Wallets

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

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