Mailspring - Mailspring is a mail client for Mac, Windows and Linux.

FileCenter - Scan & organize documents with our paperless scanning management software. Perfect to organize & manage any kind of file. ✔ Try FileCenter FREE today!

Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!

DEVONthink - DEVONtechnologies develops DEVONthink, DEVONagent, and other Mac and iOS apps for document and information management and web research.

The Bat - The Bat! is a secure desktop email client for Windows, designed to protect your correspondence against third-parties and to save your time.

PDFKeeper - Open Source PDF Document Storage Solution