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

Gaggle Mail offers group email service.

Flock is a communication app for teams. Packed with tons of productivity features, Flock drives efficiency and boosts speed of execution.

Flowdock is a group chat for teams which integrates with GitHub, Jira, Trello.

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

Riot allows teams to communicate across a wide range of collaboration apps.

Zulip is a chat and collaborative software.

Hubgets provides chat, voice and video turning team communication.

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 w…