1. Correios CepFind Brazilian addresses by zipcode, directly from Correios database. No HTML parsers.
2. Wannabe boolIf string, numeric, symbol and nil values wanna be a boolean value, they can with the new #to_b method (and more).
3. Correios FreteGem para cálculo de frete utilizando o Web Service dos Correios (http://www.correios.com.br/webservices).
4. Correios Sro XmlTracking Objects System from Correios - SRO (Sistema de Rastreamento de Objetos dos Correios)
5. Miss ElixirSome functions that I miss in Elixir standard library (and maybe you too).