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
Angela L. BrancoPR stuff & tech enthusiast. · Written
Other than Slack, this is probably your best bet in terms of ease of use and team accessibility.
CommentsTweet