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
Even if Discord is for gamers, it's easy to use and has a modern chat and has also great voice support (I mean that the quality is very very good and there is almost no latency (~10ms for me))
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