Top Alternatives to Yammer

Slack is a cloud-based team collaboration tool.

Diaspora is a nonprofit, user-owned, distributed social network that is based upon the free Diaspora software.

Basecamp is a project management web app.

Glip is fully searchable, real-time group chat; video chat, task management, file sharing app.

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

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

Bitrix24 is a free (for small businesses) social enterprise platform.

Podio is a cloud-based collaboration service.

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

Whaller allows teams and organizations to create their own internal social networks, meaning no adverts and no data exploitation.

TribeScale is an All-in-One platform to coordinate your team around what really matters - communication, goals, decisions, tasks and results.

Libertree is a free, libre, open-source software that lets people create their own social network.

Movim (My Open Virtual Identity Manager) is a distributed social network built on top of XMPP, a popular open standards communication protocol.

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

Jostle is a people engagement platform mainly focused on employee engagement.

Qortex is a project management software.

Azendoo is a project management & team collaboration platform.