I have gained access to Tamil audio data. But I cannot share it because of license. 5GB+ worth of tamil audio-text corpus, 5GB+ worth of english audio-text corpus. I think it is better to download data for all the languages to try out models for a comparative study.
You'd have to send two emails, one for requesting credentials to log on to the website, and one for requesting data. You can use the following templates from the IndicTTS site itself.
--------- For requesting credentials ---------------
--------- For requesting data ---------------