IrtRuby is a Ruby library for Item Response Theory (IRT) analysis, commonly used in educational assessment, psychological testing, and survey research. Features three core IRT models: • Rasch Model (1PL) - Simple difficulty-only model • Two-Parameter Model (2PL) - Adds item discrimination • Three-Parameter Model (3PL) - Includes guessing parameter Key capabilities: • Joint maximum likelihood by gradient ascent with an adaptive learning rate • Convergence reporting, scale identification, and exclusion of extreme response patterns • Missing data strategies (ignore, treat as incorrect/correct) • Performance and convergence benchmark scripts Intended for researchers, data scientists, and developers working with educational assessments, psychological measurements, or any binary response data where item and person parameters need to be estimated simultaneously.

Labrat is a linux command-line program for quickly printing labels. Labrat uses the wonderful Prawn gem to generate PDF files with label formatting in mind. With labrat properly configured, printing a label is as simple as: $ labrat 'Income Taxes 2021 ~~ Example Maker, Inc.' And you will get a two-line file-folder label with the text centered. It can print on dymo label printer rolls or Avery sheet labels. It knows the layout of most Avery label types. For Emacs users, labrat includes elisp code for invoking labrat from within a buffer, providing a quick way to print labels.

LicenseFinder works with your package managers to find dependencies, detect the licenses of the packages in them, compare those licenses against a user-defined list of permitted licenses, and give you an actionable exception report.

LicensePatrol works with your package managers to find dependencies, detect the licenses of the packages in them, compare those licenses against a user-defined list of permitted licenses, and give you an actionable exception report.

Musa-DSL: A Ruby framework and DSL for algorithmic sound and musical thinking and composition

An adapter for various NLU web services like Aws Lex, Google Dialogflow etc.

A comprehensive gem for Petri net modeling, colored Petri nets, matrix analysis, visualization, and formal verification for event sourcing and CRUD-to-Event mapping analysis. Part of the ORFEAS (Object-Relational to Event-Sourcing Architecture) framework.

Origami is a pure Ruby library to parse, modify and generate PDF documents.

Ruby implementation of pHash library, uses VIPS for image processing

Prawn is a fast, tiny, and nimble PDF generator for Ruby

Generate sets of labels or stickers programmatically using Prawn PDF.

Actionable Agile Metrics and Monte Carlo forecasting engine

Provides a numeric class Quaternion which is similar to a built-in class Complex.

Quby is a Rails engine that can render and update answers for questionnaires defined in a custom DSL.

This should probably never be used for anything but learning.

Extends Roo with SmarterCSV integration for robust and faster CSV parsing

The library for mathematical optimization in Ruby is designed to help solve many problems in the computational, financial, social, and energy fields and, in theory, should include components of game theory, combinatorics, probability theory, linear and nonlinear optimization, cluster, regression, and other analysis.

A Ruby game engine using OpenGL and GLFW

Ruby code translations and additional material for the book "Statistical Rethinking" of Richard McElreath

Scout gear: workflow, TSVs, persistence, entities, associations, and knowledge_bases.