The Official Guide to the TOEFL Test, Sixth Edition
This book is perfect for TOEFL iBT Preparation. Only thing lacking is the access code that is required for downloading the audio tracts and practice software.
The GMAT® Official Guide 2018 helps you improve your quantitative, verbal and integrated reasoning skills with over 900 practice questions and answer explanations from real exams.
Britannica 2015 (32 volumes) for Babylon and MDict
This is both main series and "children's" version of Britannica Encyclopedia for Babylon (.BGL format) and MDict (.MDX). The pictures are not included due to massive size. There are 118.000 entries in total. It's compiled from official DVD. Hope you enjoy it.
I tested BlueDict in my Android smartphone and it couldn't show the MDX files; but MDict app could.