VisionIAS.net is a popular website for UPSC IAS exam preparation that offers free study material. It also provides CSE-related audio notes for various subjects/papers, important news/events discussions, current affairs, etc. that can be downloaded for offline use.
Civil Services Audio Notes is another popular website that offers CSE audio notes. It provides affordable audio study material covering various topics related to CSE papers.
IAS Abhiyan is another good website where IAS aspirants can download audio notes from to prepare for the CSE. It has audio notes for several subjects, including General Science and Technology, Geography, History of India, and Indian Polity among others.
IAS Exam Portal is another website that provides audio courses and daily voice notes for UPSC IAS aspirants on various topics.
Study Dhaba is another good website that has a great collection of audio notes for IAS preparation, including AIR discussions, lectures on different subjects/papers, Vajiram Classroom recordings, current affairs, etc.
Free UPSC Materials also offers audio notes and lectures for UPSC IAS aspirants. The website has audio notes for some CSE Main Optional subjects; these audio notes can be downloaded for offline use.
AFE IAS a popular website IAS exam preparation. Its classes are conducted by former civil servant Dr. Vijay Agrawal to provide right guidance to aspirants. The website offers audio notes in Hindi on various topics for IAS aspirants.
Hindi Audio Notes is another website that has audio notes on various topics and current affairs that can be useful for aspirants in UPSC IAS preparation.