Grammy is a parser with a simple DSL to define the grammar and tree transformations.

ffi-swig-generator is a ruby-ffi wrapper code generator based on SWIG interface files. ffi-swig-generator is able to traverse a XML parse tree file generated by the +swig+ command and to produce a ruby-ffi interface file from it. ffi-swig-generator is shipped with a command line tool (ffi-gen) ...

Kiwi is a schema-based binary format for efficiently encoding trees of data.

EncodeM v3.0 brings complete M language (MUMPS) subscript encoding to Ruby, supporting numbers, strings, and composite keys with perfect sort order. Build hierarchical database keys like M("users", 42, "email") that sort correctly as raw bytes. This 40-year production-tested algorithm from YottaD...

The RKelly library will parse JavaScript and return a parse tree, fixed to support ruby 1.9.3

Rockit is a potent parser generator and gives you AST's (Abstract Syntax Tree's) which you can pattern match and pretty-print. Rockit does not distinghuish between lexing and parsing so the generated parsers are scanner-/lexer-less. The vision is to extend Rockit with more advanced compiler-relat...

Parses simple mathematical expressions, creates a fully object-oriented expression tree. Evaluation can have injected variables.

Pure Ruby YANG parser and tree structure data store implementation

Ruby micro framework for easy create ruby applications (daemons, EventMachine-apps, db-apps, cli...). Features: bundler, environments, activesupport, rails dirs tree. Fast loading and low memory using.

Library and program for finding all RubyGems gemspecs in a directory tree

Generates an HTML tree from XML or Markdown.

Testing how to create a gem. Might be home to an amazing gem later.

Base Netzke widgets - grid, form, tree, and more

A simple and complete ACL system for Rails, that allows to specify a role for an user for a single resource.

Base Netzke widgets - grid, form, tree, and more

Generate a tree structure from a text file indented by spaces.

A Treetop parser for alias files

Takes a XSD string and parses it into a tree structure of nodes. A lot similar to Nokogiri but with few more useful methods.

API documentaiton at: http://www.rubydoc.info/gems/taxonomite Manages objects classified within a taxonomy and enforces a hierarchical tree structure. Works only with MongoDB currently - may try to abstract the database layer with later versions.

Lichess API wrapper