RuboCop is a Ruby code style checking and code formatting tool. It aims to enforce the community-driven Ruby Style Guide.

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

Watir stands for Web Application Testing In Ruby It facilitates the writing of automated tests by mimicing the behavior of a user interacting with a website.

JSON Schema validator. Supports drafts 4, 6, 7, 2019-09, 2020-12, OpenAPI 3.0, and OpenAPI 3.1.

Validate a regular expression string against what ECMA-262 can actually do.

Mutation Testing for Ruby.

JsRegex converts Ruby's native regular expressions for JavaScript, taking care of various incompatibilities and returning warnings for unsolvable differences.

The base package maps Ruby syntax to JavaScript semantics. Filters may be provided to add Ruby-specific or framework specific behavior.

Supports JSON content, custom HTTP headers, and post-processing of extracted content.

Ruby bindings for Z3 Constraint Solver

Ducalis is RuboCop based static code analyzer for enterprise Rails applications.

Mutation testing for ruby

I bring some sugar for your JSONs.

openstudio base gem for creating generic extensions with encapsulated data and measures. Also contains ruby libraries that required by many measures.

Regexp pretty printer and formatter for Ruby

Pkl parser for Ruby

Easily generate strings supplying a very simple pattern. '10-20:Xn/x/'.generate #>qBstvc6JN8ra. Generate random strings using a regular expression (Regexp): /[a-z0-9]{2,5}w+/.gen . Also generate words in English or Spanish. Perfect to be used in test data factories. Also, validate if a text fulfills a specific pattern or even generate a string following a pattern and returning the wrong length, value... for testing your applications.

kleene is a library for building regular expression recognition automata - nfas, dfas, and some specialty structures.

RbHint is a Ruby code style checking and code formatting tool. It aims to encourage adoption of the community-driven Ruby Style Guide.

Simple JSON Schema validator. Supports draft 7 partial, based on https://github.com/davishmcclurg/json_schemer