・PDF Reader
Sumatra PDF
https://www.sumatrapdfreader.org/free-pdf-reader
PDF-XChange Pro
https://www.tracker-software.com/product/pdf-xchange-pro
Adobe Acrobat Pro
https://www.adobe.com/acrobat/acrobat-pro.html

・Image Viewer
IrfanView
https://www.irfanview.com/
XnView Classic
https://www.xnview.com/en/xnview/
XnView MP
https://www.xnview.com/en/xnviewmp/

・Image Converter
XnConvert
https://www.xnview.com/en/xnconvert/

・Comic Viewer
NeeView
https://bitbucket.org/neelabo/neeview/wiki/Home

・E-book Management Software
calibre - E-book management
https://calibre-ebook.com

・E-book Related
DeDRM_tools
https://github.com/apprenticeharper/DeDRM_tools/releases
KindleUnpack - The Plugin + ZIP mod
https://www.junk2ool.net/tools/kindle/start

・Mind Mapping Software
XMind
https://xmind.net/
XMind（日本語版）
https://jp.xmind.net/

・To-Do List Software
Microsoft To Do: Lists, Tasks & Reminders
https://todo.microsoft.com/tasks/

・Diary software
wDiary
http://www.cc9.ne.jp/~pappara/wdiary.html