On somewhat more familiar formats,
the Japanese web novels, which are very indie, and the more traditionally published serial magazines.
A list of sites that directly lets you downloads light
novels and
web novels (Korean,
Japanese, English, Chinese, etc.) in PDF and EPUB versions for free!
For example, «scanlations» (which are fan driven translations of entire manga series using scans of the original
Japanese or Korean language graphic
novels, photoshopping out the original dialog, and then inserting translated dialog, prepared without compensation by the translators and made available on the
web), were silently tolerated for many years by the publishers of those works, even though they are clear and obvious copyright violations as derivative works.