title_body: Which ePub readers are available for Windows? On my Android devices I use Aldiko and Moon Reader Pro, depending on my mood.
  On Windows, however, I am still stuck with FBReader and the reader bundled with Calibre, and I don't like very much both of them. (Adobe Digital Edition is a heavy program). 
  I would prefer a standalone program which runs on Windows 7 too, and I don't like browser extension since my browsers already use a lot of RAM. Any suggestions?
upvoted_answer: You can try IceCream Ebook Reader:
  
  
    Meet Icecream Ebook Reader, one of the best free EPUB readers that transforms your computer screen into a convenient top-notch ebook reader. The tool enables you read ebooks in EPUB, MOBI, FB2, PDF and other popular formats. Manage your digital library on your PC or Windows-based laptop. This program also features the ability to turn pages, use bookmarks, search your library, track reading progress and much more.