Nine – Exchange ActiveSync Alternatives

Email, calendars, and contacts to highest standards of security, privacy and reliability.

paid Free Trial $3.0 / Monthly (per user)

Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues

Open Source

VoIPstudio is an award-winning VoIP system that offers businesses of all sizes a scalable communication solution. It’s inexpensive, easy-to-use, offers a full suite of PBX features, and is fully integrated for CRM.

Try for free paid Free Trial $4.99 / Monthly (User)

BlueMail is an email management app for Android, iOS, and Windows.

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Team communication app now supporting FB, Twitter & SMS

freemium $14.0 / Monthly (^ 6 months history)

Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.

freemium

Emailing for teams: Organize your Inbox into channels 💌

K-9 is an opensource email client making it easy to chew through large volumes of email.

Email lives forever!. Reinvigorate your emailing experience with the best free email client, the Mailtrim

free

MailDroid is an email app that you can use to manage your emails from multiple vendors in one unified inbox.

Claws Mail is an email client (and news reader), based on GTK+, featuring Quick response

Secure email with absolutely no compromises. Get your free encrypted email account today.

freemium €5.0 / Monthly (user - 5 GB)

Hexamail Flow is an email client application for desktop that you can use to manage, send, and receive emails from multiple providers in one unified place.