SpamAssassin - Use this program to "Unspam" your mailbox(es).
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
MailScanner - MailScanner is a open source email security system design for Linux-based email gateways.
Fantastical 2 - Fantastical, the Mac calendar app you'll enjoy using. Quickly create new events with natural language input and more.
Rspamd - Rspamd is an advanced spam filtering system that allows evaluation of messages by a number of rules...
Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...