Rails Validations for typically UK specific data

Generate an Ulam spiral sequence. PNG output available.

ULID Ruby C Extension

U::Log is a very simple logging library made for humans

Manipulate zones or add, update, remove records in UltraDNS

Access ulysses library by ruby

CLI tool for video downloading

Umbreo Command Line Interface

Umlaut plugin for BorrowDirect linking

Learn Enough Ruby palindrome detector

Umwelt is a domain architecture development(knowledge management) tool, for handy prototyping domain specification with code structure.

Generate random unambiguous strings (no ilo06b2z chars)

UnasukeCop is a RuboCop configration gem that optimisation to unasuke.

A gem that lets you call into the Camelot Unchained API. You can see the API docs at https://api.camelotunchained.com

Provide ISO 3166 codes and english name for countries and their political divisions

Uncle Kryon server (& hacker) for the Uncle Kryon mobile apps.

A mutex that uses Redis that is also not complicated.

API Client for the Weather Underground

undo-manager makes it easy to add undo/redo functionality to a Ruby (on Rails) app.

Provides a Result class for more elegant, exception-free error handling. Especially useful for processing input that could be invalid for many different reasons.