1)   Boldcenter Operator Client .NET 4.13
Free live chat software for online sales and support teams. Increase sales, improve customer service, and reduce support costs. Simply install and add a chat button to your site to get started. Paid editions allow managing leads, emails, and tickets.

 2)   Subscription Mailer 1.0
When you keep maillist on the site and want to send newsletters that is very important to keep tracking who really received your message. This useful mailing software has unique feature of tracking who, when and where 100% read your email.

 3)   Free Mail Commander 10.5
Free Mail Commander is a fast and portable e-mail client with user-friendly interface. Program supports SMTP, POP3, IMAP4, can receive and read plain text and graphic html messages with embedded images, works with secure ssl/tls connections.

 4)   Mail Commander Deluxe 10.0
Full-featured super-fast email program with business contact information manager that does it all - from the everyday sending and receiving of e-mails to managing mailing lists and processing website leads.