Simple tool to read books in the FB2 format.  Developed using GTK+3.
Its features:

  - Supports *.fb2 and *.fb2.zip files
  - Full 2.1 format support (without stylesheet and partial
    table tag support)
  - Saving reading position, window state, size, and position
  - Search for specific text in the book
  - Russian and English GUI, user themes, autoscrolling, hotkeys

WWW: https://github.com/Cactus64k/simple-fb2-reader