If you want to replicate a site section with some change (like translation) and mantain the url pretty maybe this is the right library.

ProductSpy is made for parsing product URLs, i.e. Amazon-URLs, to get the product keys and creating product URLs based on these keys. This can be used to identify products based on the url or just to clean up product URLs.

Financial engineering module of Hydrogen Atom

This gem makes testing your proxy easy.

Test proxies to be sure it works

If you not sure, think a little about using of Yandex Kassa instead :)

Print Stuff Mail provides an RESTful API for sending snail mail. This library eases interfacing with it.

Adapters to work with Publishing Platform APIs

Pullr is a Ruby library for quickly pulling down or updating any Repository. Pullr currently supports Git, Mercurial (Hg), SubVersion (SVN) and Rsync. Pullr provides a command-line utility and an API which can be used by other frameworks.

Ruby SDK For QCloud COS, Enjoy it!

a gem is qcloud vod package

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

This GEM is designed to work for Chinese SEOers who need to fetch query and parse results from all kinds of search engines

Quokka provides tools to make logging in with Facebook from your server a breeze.

A API wrapper for Quorum

Save data into your mongo collections through a rack app

Middleware for signing urls

Simple and highly customizable Web Framework encouraging to build an app as a set of low-coupled components instead of monolith

Some basics that your application could benefit from.

Threaded reverse proxy for Ruby on Rails