Many thanks to the authors of the 3rd party code used in Boxshot. Here is the list in the alphabetical order.

Assimp

Copyright (C) 2007-2015 Assimp Development Team.
All rights reserved.
Licensed under a BSD license.
http://www.assimp.org/

FBX SDK

Copyright (C) 2012 Autodesk, Inc.
All rights reserved.
http://www.autodesk.com/fbx

FreeImage

(C) 2003-2013 by FreeImage
This software uses the FreeImage open source image library.
FreeImage is used under the FIPL, version 1.0
http://freeimage.sourceforge.net

FreeType Library

FreeType is a freely available software library to render fonts.
Licensed under the BSD-like FreeType license
https://www.freetype.org/index.html

glew

Copyright (C) 2002-2008, Milan Ikits <milan ikits[]ieee org>
Copyright (C) 2002-2008, Marcelo E. Magallon <mmagallo[]debian org>
Copyright (C) 2002, Lev Povalahev
All rights reserved.
http://glew.sourceforge.net/credits.html

HARU

Copyright (C) 1999-2006 Takeshi Kanno
Copyright (C) 2007-2009 Antony Dovgal
Haru is distributed under the ZLIB/LIBPNG License.
https://github.com/libharu/libharu

Intel Embree

Copyright 2009-2014 Intel Corporation
https://github.com/embree/embree

google-breakpad

Copyright (c) 2006, Google Inc.
All rights reserved.
http://code.google.com/p/google-breakpad/source/browse/trunk/COPYING
Available under the New BSD License
http://www.opensource.org/licenses/bsd-license.php

Little CMS

Copyright (c) 2010, 2011 Marti Maria Saguer. All rights reserved.
Little CMS engine is provided free of charge under MIT LICENSE
http://www.littlecms.com/

PDFium

Copyright (c) 2017 PDFium Authors. All rights reserved.
Use of this source code is governed by a BSD-style license.
https://pdfium.googlesource.com/pdfium/

Qt GUI Toolkit

Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
Qt is available under the LGPL.
http://qt-project.org/doc/qt-4.8/lgpl.html

QtSingleApplication

Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
All rights reserved.
This file is part of a Qt Solutions component.
Available under the BSD License
http://qt.gitorious.org/qt-solutions/qt-solutions