Online IELTS Resources

Official Cambridge IELTS preparation materials:

e.g. online materials; IELTS library etc.
https://www.cambridgeenglish.org/ielts-practice/

IDP Free IELTS Resources:

e.g. Free Practice Tests; Free IELTS In-person Seminars & Online Masterclasses; IELTS Blog; IELTS Preparation Newsletter by IDP Canada etc.
https://idp.ieltscanadatest.com/preparation-resources-for-ielts-test-takers/test-preparation/other-free-ielts-resources/

British Council

1. IELTS　Preparation
https://takeielts.britishcouncil.org/take-ielts/prepare

2. Videos (the following are within the list)
i. IELTS Listening: Improve your English and prepare for IELTS Listening
https://www.youtube.com/watch?v=I_3qJobgmFQ

ii. IELTS Speaking: Improve English & prepare for IELTS – Vocabulary
https://www.youtube.com/watch?v=LQQE2hWrl98

IELTS-Exam.net

e.g. Writing 1, Writing 2, Speaking, Reading and Listening etc.
https://www.ielts-exam.net