Top Alternatives to Microsoft SharePoint

ownCloud is a free and opensource file sync and share app which is self hosted.

Basecamp is a project management web app.

ZOHO Corporation offers online business, network, and IT infrastructure management applications, and software maintenance and support services.

MediaWiki is free and open-source wiki software.

Nextcloud is a suite of client-server software for creating file hosting services and using them. It is functionally very similar to the widely used Dropbox, with the primary functional difference being that Nextcloud is free and open-source, and thereby allowing anyone to install and operate it without charge on a private server.

Tiki Wiki CMS Groupware or simply Tiki, originally known as TikiWiki, is a free and open source Wiki-based content management system and online office suite written primarily in PHP.

Tresorit is an online cloud storage service based in Switzerland and Hungary that emphasizes enhanced security and data encryption for Businesses.

MOOVIA is an enjoyable and secure social environment to host your team`s projects, tasks, meetings, ideas, messages and documents.

XWiki is a free wiki software platform written in Java with a design emphasis on extensibility.

eXo Platform is an open source, standard-based, Enterprise Social Collaboration Platform.

lfresco Community Edition is an open source enterprise content management system.

Drupal is a free and open source content-management framework written in PHP and distributed under the GNU General Public License.

Kolab Now is a web-based email and groupware service, based completely on free and open-source software.

Confluence is a team collaboration software. Written in Java and mainly used in corporate environments.

HumHub is a free social network software and framework built to give you the tools to make teamwork easy and successful.

5pm is a Web-based project and task management software.

Nuclino is a cloud-based team collaboration software which allows teams to collaborate and share information in real-time.

Clockingit is a project management, collaboration and time tracking tool.

Sohodox is the simplest document management system for small businesses.

Globodox creates user-friendly document management software systems which help run small to medium sized companies and organizations efficiently.

Portofino is a web application framework for Java and Groovy developers. Its purpose is to help developers create outstanding enterprise applications.

Emgage Prime is a SharePoint or Office 365 Intranet with this quick to deploy, easy-to-use solution.

Huddle is a team collaboration & project management software for enterprise and government.

Process Street is a checklist software.