Many organizations offer free online tutorials and test samples for the people who wish to take the IELTS exam. The joint owners of the IELTS tests, British Council, Cambridge English Language Assessment and IDP are good resources.
In addition to British Council, Cambridge English Language Assessment and IDP (for IELTS Australia), the list includes the official organization for IELTS as well as many supporting networks, such as IELTS-Exam or IELTSforFREE.
The alternative source for language learners is libraries. British Council and IDP have offices in many countries, which often come with a library. General access to the library might include a fee, but it is often the case that a test taker gains privileged access once she registers to take the test at the location. Some public libraries also have collections of books and CDs on IELTS for their members.