Goofy is a microframework for web applications(heavily based on Cuba).

A web framework built on top of Rack, it has the simplicity of sinatra and the structure of rails

A fake govuk notify service that sends emails via smtp for ease of testing

Use Builder in Grape

Use erb in grape

Yet another ruby framework

This is a mini framework built with ruby.

Guinness is a micro framework for building static websites.

Gurk

Web GUI for controlling Gush workflows

Use hobbit with some template niceties and other conveniences.

Simple HTTP server which allows transpiling HAML files through HTTP request using Ruby implementation

Use Handlebars templates precompiled and wrapped in a AMD define block, with the asset pipeline in Rails 3.1+ applications.

View helpers for your custom Rack app or framework.

yet another static sites generator

Framework for creating self-describing APIs

Haxe adapter for the Rails asset pipeline.

Compiles HAML CoffeScript templates into a client-side JavaScript code

Simple web framework for building web apps in Ruby following the MVC design pattern

Lovable HTML view helpers for use with ERB.