TwiPodcast is a web app which allows you to listen podcast or any mp3 media file on your phone for free without internet.
The webapp is live at http://sandipbgt.github.io/twipodcast
The api is live at https://twipodcast.herokuapp.com
If you have got 1 minute time, then say hi to me at my email: firstname.lastname@example.org. I would be happy to have friendship with you.
The documentation is available at http://sandipbgt.github.io/twipodcast/docs
Feel free to submit a pull request or an issue!