Capybara is an integration testing tool for rack based web applications. It simulates how a user would interact with a website

Roo can access the contents of various spreadsheet files. It can handle * OpenOffice * Excelx * LibreOffice * CSV

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.

A nifty gem, in pure Ruby, to parse PDF files and combine (merge) them with other PDF files, number the pages, watermark them or stamp them, create tables, add basic text objects etc` (all using the PDF file format).

An add-on converter for Asciidoctor that converts AsciiDoc documents to PDF using the Prawn PDF generation library.

A general classifier module to allow Bayesian and other types of classifications.

Ball Aerospace COSMOS provides all the functionality needed to send commands to and receive data from one or more embedded systems referred to as "targets". Out of the box functionality includes: Telemetry Display, Telemetry Graphing, Operational and Test Scripting, Command Sending, Logging, and more.

Machine learning for Ruby. Supports regression (linear regression) and classification (naive Bayes)

ViewComponents for the Primer Design System

Reckon automagically converts CSV files for use with the command-line accounting tool Ledger. It also helps you to select the correct accounts associated with the CSV data using Bayesian machine learning.

Visualizing your data in a simple way.

Extract tables from PDF as a structured info. Uses ghostscript to print pdf to image, then recognizes table separators optically. No OpenCV or other heavy dependencies

Uses GithubStats to grab Github contributions scores and converts that into an SVG

Universal S-expression parser with specific support for Common Lisp, Scheme, and RDF/SPARQL

Red Colors provides a wide array of features for dealing with colors. This includes conversion between colorspaces, desaturation, and parsing colors.

giblish generates indexed and searchable documents from a tree of asciidoc files.

A Ruby implemenation of the well-known graph library called "networkx".

Perfect Shape is a collection of pure Ruby geometric algorithms that are mostly useful for GUI manipulation like checking viewport rectangle intersection or containment of a mouse click point in popular geometry shapes such as rectangle, square, arc (open, chord, and pie), ellipse, circle, polygon, and paths containing lines, quadratic bézier curves, and cubic bezier curves, potentially with affine transforms applied like translation, scale, rotation, shear/skew, and inversion (including both the Ray Casting Algorithm, aka Even-odd Rule, and the Winding Number Algorithm, aka Nonzero Rule). Additionally, it contains some purely mathematical algorithms like IEEEremainder (also known as IEEE-754 remainder).

SolidRuby is a framework for programming OpenScad models in Ruby. \ Inspired by CrystalScad and SolidPython, based on CrystalScad and RubyScad

Modular components to encapsulate data and markup in Prawn