Top Alternatives to Grape

Slack is a cloud-based team collaboration tool.

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

Mattermost is an open source, private cloud Slack-alternative, Workplace messaging for web, PCs and phones. MIT-licensed.

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

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

Hibox provides task management, business chat and video calls.

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

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

Fleep enables communication within and across organizations, be it your team chats, project communication or 1:1 conversations.

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

Dialog Messenger is a handy and feature-rich enterprise multi-device messenger available for server or cloud.

Gitter is an open source instant messaging and chat room system for developers and users of GitHub repositories.

Hack Chat is a minimal, distraction-free chat application.