Extract root domain from hosts (e.g. www.example will be extracted as example.com). It normalizes punycode domains and considers second-level domain names.

Simple way to send filter parameters to rails models.

Basic serializers

Use a given JSON and fields names to generate a CSV.

Create SVG sprites using SVG links.

Simple captcha based on plain text questions.

Retrieve time objects by time windows (e.g. TimeWindow.call('5m') will round minutes to multiples of 5).

Touch a parent's collection on ActiveRecord.

Password Validators including Dropbox ZXCVBN algorithim

A simple serializer implementation.

Create and verify signed urls. Supports expiration time.