What's the best solution for communicating with ~10 people on a group project?

Not email... Slack is the obvious choice, but looking for something messaging related that's more temporary. Coordinating with a group of 10-15 people for a couple of weeks.
Niv DrorWriter/Social Editor @ProductHunt · Asked
3
Rocket.Chat

Your own open source Slack-like chat

Adriano CahetéUX Designer & FrontEnd Developer · Written
It's like a Slack, but it's open source and self hosted. You can start a RC installation fast with a Digital Ocean Droplet.
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