Missive - Team communication app now supporting FB, Twitter & SMS
MailStore - MailStore Home - A 100% free single-private-user desktop solution
Mailtrim - Email lives forever!. Reinvigorate your emailing experience with the best free email client, the Mailtrim
Mail Backup X - Your one stop mail backup and archiving tool for Mac.
Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.
Mail Archiver X - Mail Archiver X protects one of your Mac-based small business' most important assets.