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Slack - A messaging app for teams who see through the Earth!
Apache Airflow - Airflow is a platform to programmaticaly author, schedule and monitor data pipelines.
Zulip - Chat for distributed teams. Zulip combines the immediacy of real-time chat with an email threading model. With Zulip, you can catch up on important conversations while ignoring irrelevant ones.
Pushwoosh - Mobile-inspired customer engagement platform for high achievers
Weet - Weet is the 1st asynchronous video messaging tool built for remote teams