If you are looking for classic or independent works, these libraries offer extensive FB2 archives:
: Known as "Litres Authors," this section features a vast collection of free samizdat available for immediate download in FB2, EPUB, and PDF. samizdat knigi skachat besplatno fb2
:: Самиздат - ЛитЛайф - книги читать онлайн - ЛитЛайф If you are looking for classic or independent
: Functioning as both a social network for readers and a library, LitLife allows users to download samizdat works without registration in many cases. samizdat knigi skachat besplatno fb2
These sites are the primary hubs for independent authors. Many offer a "read for free" option or allow downloads in various formats: