calibre - Ebook manager, viewer & converter
PuTTY - Popular free terminal application. Mostly used as an SSH client.
FBReader - FBReader is an e-book reader for various platforms. Features:
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.
iTerm2 - A terminal emulator for macOS that does amazing things.