Vaultastic - Vaultastic’s on-demand SaaS platform provides Protection, Visibility & Control for your Critical Business Data with Agile Cloud Archival.
Roundcube - Web-based IMAP email client
MailArchiva - MailArchiva is an email archiving, email compliance, and e-Discovery enterprise server.
HEY - Email at its best, new from Basecamp.
MailBakup - Mailbakup is an all-in-one IT solution that provides an in-demand set of e-mail backup solution to save valuable data from the web-based email account to location derive easily and quickly.
Mailo - Mailo is an email client where you can send and receive emails to and from anyone with an email address.