Best Exchange Alternatives & Competitors in 2025

Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.

Boost your productivity with reliable access anywhere with services like email, calendar, file sharing, meetings, instant messaging, and Office Online

The #1 email warming service to improve your deliverability by generating realistic and meaningful engagement to your emails. Easy-to-use solution to help you land in the main inbox instead of the spam folder.

Visit website paid $19.5 / Monthly (Pro)

A fully fledged, free email server solution, an open source project (GPL v2).

Open Source

Borrow top engineers to interview your candidates.

Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.

Gmail is available across all your devices Android, iOS, and desktop devices. Sort, collaborate or call a friend without leaving your inbox.

Technical screening platform to hire software engineers

SOGo is groupware server with a focus on scalability and open standards.

Open Source

Web-based IMAP email client

Open Source

With Nextcloud enterprises host their own secure cloud solution for storage, collaboration & communication from any device, anywhere.

Open Source

An acquisition marketplace for profitable internet businesses. We make it anonymous & free for owners of $100K+ revenue startups to attract full & partial acquisition offers. Free for acquirers to join for a limited time. No commissions, ever.

freemium $399.0 / Annually (Launch pricing (with limited time discount code))

YouTeam is a new, smarter way to outsource.

Lemon.io is a community of vetted offshore developers for startups.