Hello The only e-book reader in Trinity (TDE) is kbookreader-trinity. But kbookreader-trinity seems not to be able to display a simple epub, which is the standard format for electronic books. kbookreader-trinity seems to be a software in a very early stage of development, in a sketch or draft phase. I think there is a better (faster and easier) option than spending time developing kbookreader-trinity. fbreader is a complete and lightweight e-book reader. Its only problem of this reader is that it was abandoned in 2015, just when version 1.0.0 was expected, but its original developers decided to start the development of a new non-free version. The good thing is that the source code of the original free fbreader is there, orphan, waiting to be adopted by someone. fbreader is the most complete among the existing light e-book readers, it is free software (GPL/LGPL licenses), written in C++, its integration into TDE should be easy (the source code includes GUIs in cocoa, gpe, gtk, qt3, qt4 , qtopia,...) and it already has all the main expected features so it is not need to active development of new features in order to be useful. The official source code is https://github.com/geometer/FBReader In Debian, where is without maintainer, an older version is packed, see https://packages.debian.org/fbreader Thank you so much!