Backup

Copiers (see review)

• emClient
• Thunderbird
• Postbox
• Microsoft Outlook
• Mailbird
• Opera Mail
• The Bat (€20) - secure and encrypted, but dated appearance
• Pegasus Mail (powerful, secure, but dated interface)
• i.scribe (small, portable, useful, but poor IMAP support)
• Nylas N1 (free for "Basic" but $12 per month for "Pro!")
• SendEmail - command line utility to send emails!

Email sync

• AkrutoSync to sync Outlook with iPhone or Android directly (not via cloud)

PDF

• Foxit Reader
• PDFill PDF Tools (Free)
• PDF Shaper