The best alternatives to Talkk are Zulip Team Chat, Chalk, and Rushline. If these 3 options don't work for you, we've listed a few more alternatives below.
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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.
Pop connects you to your local community. Join your city and neighborhood group chats and get a live story of what's happening around you. Staying connected to your local community is more important than ever. Feel your sense of belonging with your neighbors.