Microsoft SharePoint Alternatives for Mac OS X

ownCloud is a powerful, self-hosted open-source platform for file sync, share, and collaboration. It provides a private cloud alternative, giving users full control over their data while offering secure and convenient access from anywhere.

Nextcloud is an open-source, self-hosted platform for file synchronization, sharing, and collaboration. It provides a private alternative to commercial cloud storage services, offering a comprehensive suite of tools including file management, calendar, contacts, and notes, all under your control.

Tiki Wiki CMS Groupware is a free and open-source, all-in-one web-based application for collaboration and management. It combines a powerful wiki engine with comprehensive features for content management, project tracking, workflow, and office functions, making it a versatile solution for diverse organizational needs.

Samepage is a comprehensive team collaboration platform that integrates project management, task management, real-time communication, and file sharing into a single, intuitive interface. Designed to streamline teamwork, it helps teams stay organized, communicate effectively, and manage projects efficiently, regardless of location.

Tresorit is a leading cloud storage and collaboration platform for businesses, prioritizing end-to-end encryption and zero-knowledge architecture. It offers secure file sharing, synchronization, and online backup, ensuring data privacy and compliance with stringent regulations.

XWiki is a powerful, open-source wiki software platforms written in Java, designed for creating collaborative knowledge bases, documentation, and collaborative workspaces. With a strong emphasis on extensibility, it supports multiple languages, real-time collaboration, and a wide range of features for content management and team productivity.

eXo Platform is an open-source enterprise social collaboration platform designed to connect employees, share knowledge, and improve communication and productivity within organizations. It offers a comprehensive suite of tools including social networking, document management, project management, and real-time communication features.

Alfresco Community Edition is a powerful open-source enterprise content management (ECM) system offering robust document management, collaboration, and workflow capabilities.

Open Atrium is a powerful open-source collaboration and project management platform built on Drupal. It provides a modular framework to create customized intranets, team sites, and project workspaces, facilitating communication, document sharing, task management, and more within organizations.

HumHub is a free and open-source social network software and framework designed to empower teams and businesses with a platform for effective collaboration and communication. It provides a centralized hub for projects, tasks, and social interaction within an organization.

Portofino is an open-source web application framework designed for Java and Groovy developers. It simplifies the creation of enterprise-grade web applications by providing robust features for CRUD operations, content management, and business logic implementation.