・Mailer
秀丸メール
https://hide.maruo.co.jp/software/tk.html
Thunderbird
https://www.thunderbird.net/

必須アドオン

uBlock Origin
CardBook
Display Mail User Agent T
DKIM Verifier
FiltaQuilla
Minimize on Close
Quicktext
Simple Startup Minimizer
Web Translate

・Messenger Software
Discord
https://discord.com/
Telegram
https://telegram.org/
Signal
https://signal.org/
Element
https://element.io/

・Collaboration Platform Software
Zoom
https://zoom.us/download
Microsoft Teams
https://www.microsoft.com/microsoft-teams/group-chat-software

・Archiver & Extractor Software
7-Zip
https://www.7-zip.org/
7-Zip Zstandard Edition
https://github.com/mcmilk/7-Zip-zstd/releases
WinRAR
https://www.rarlab.com/
Universal Extractor 2
https://github.com/Bioruebe/UniExtract2/releases
InnoExtractor
https://github.com/dscharrer/innoextract/releases
caldix
http://www.kmonos.net/lib/caldix.ja.html