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

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

Integromat is an easy to use, powerful tool with unique features for automating manual processes.

Kifi creates a full-text index of every web page shared, making them easier to find in Slack, Google search.

Quip is a collaborative productivity software suite for mobile and the Web.