Slack is described as 'Facilitates teams' real-time collaboration with versatile chat interface and advanced search in configurable channels across multiple platforms' and is a leading Group Chat app in the social & communications category. There are more than 100 alternatives to Slack for a variety of platforms, including Web-based, Android, iPhone, Windows and Mac apps. The best Slack alternative is Element. It's not free, so if you're looking for a free alternative, you could try Element or Zulip. Other great apps like Slack are Rocket.Chat, Discord, Matrix and Wire.
Rivers is a free communication and collaboration app that lets you have more organized and focused conversations. Whether you are a part of a company or friend group i.e. community, you will organize your conversations around topics. Create your cube.
SaaS intranet platform for information management apps for business and private use. Tasks, notes, notebooks, incident with root-cause analyze, checklists and much more.
InterStis is a collaborative plateform made for teamworks who want to reduce email, and communicate easily.
Markee is a simple, secure and brandable alternative to Slack and Zoom. With Markee you can host video meetings, chats, and share files with anyone you choose — all from your browser.
With Instaforum, you can build a forum website that's as simple and usable as a modern messaging app. It can be public or private, and users don't have to install anything. It's easy to set up, runs on your domain with your branding, and you control your data.
A bird's eye view of everything that matters to you, be it your personal to-do's, team tasks or projects. As a project monitoring tool, Zapty also allows organizing and planning around more sophisticated projects, sharing, proofing, collaborating, and managing documents...
Slack is so expensive, Ziggs is free and has much more features
Team communication without the noise and distraction of instant messaging. Messages are sent on a fixed two hour schedule, giving plenty of time to get into deep work and flow.
Self-hostable open-source chat solution offering text, voice, and video with fine-grained roles, forum threads, DM workspace, browser soundboard, custom emoji, PWA offline support, push notifications, analytics tools, and advanced moderation capabilities.
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I like about Ziggs.io that you don't have to register and much faster than any other platforms since they don't store the messages.