Inout Webmail
Description: Inout Webmail is a free, open-source webmail client that can be self-hosted. It has a simple, easy-to-use interface, supports multiple email accounts, contacts, calendar, and more. Good alternative for those looking to host their own webmail service.
Type: software
Pricing: Open Source
Zimbra Collaboration Suite
Description: Zimbra Collaboration Suite is an open source email and collaboration platform. It includes email, contacts, calendar, document management, and other collaboration tools. Zimbra is designed for enterprises and service providers.
Type: software
Pricing: Open Source