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
53
Slack

Be less busy. Real-time messaging, archiving & search.

Bharath B LohrayPhD student at Texas Tech University · Written
Managed hosting, quick to setup and run.
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