Top Alternatives to Slack

Google Hangouts was a versatile communication platform offering instant messaging, voice and video calls, and SMS capabilities directly from web browsers and mobile devices. Integrated deeply with Gmail and other Google services, it provided a convenient way to connect and collaborate across various platforms.

Jitsi is a free and open-source suite of secure, flexible communication tools. It offers multi-platform support for voice (VoIP), video conferencing, and instant messaging, emphasizing privacy and ease of use with no account required to start a meeting.

Basecamp is a web-based project management and team collaboration tool designed to simplify communication, task management, and document sharing for teams of all sizes. It focuses on transparency and centralizing project information.

Glip, by RingCentral, is a comprehensive team collaboration platform combining real-time messaging, video calls, task management, and file sharing into a single, searchable hub. Designed to streamline communication and workflow, it aims to replace disjointed tools with a unified digital workspace.

Samepage is a comprehensive team collaboration platform that integrates project management, task management, real-time communication, and file sharing into a single, intuitive interface. Designed to streamline teamwork, it helps teams stay organized, communicate effectively, and manage projects efficiently, regardless of location.

Mattermost is an open-source, self-hosted platform for secure team collaboration, offering a Slack-alternative with emphasis on data control, privacy, and customizability. It provides a range of communication and project management tools for distributed and technical teams.

Wire is a secure, cross-platform messaging and collaboration client offering end-to-end encryption by default for all communication types including messaging, voice and video calls, and file sharing across desktop and mobile devices.

Rocket.Chat is a comprehensive free and open-source team communication platform, offering real-time chat, audio/video conferencing, screen sharing, and file sharing. Designed for flexibility, it can be self-hosted on-premises for maximum control and customization, making it ideal for organizations prioritizing data privacy and security.

eXo Platform is an open-source enterprise social collaboration platform designed to connect employees, share knowledge, and improve communication and productivity within organizations. It offers a comprehensive suite of tools including social networking, document management, project management, and real-time communication features.

Threema is a secure and private messaging application that prioritizes user anonymity and data protection. It offers end-to-end encryption for all messages, calls, and files, requiring no phone number registration to enhance privacy.

Matrix is an open network for secure, decentralized real-time communication. It provides a flexible protocol for developers to build collaborative applications like instant messaging, VoIP, and video conferencing, enabling seamless communication across different service providers.

Let's Chat is a self-hosted, open-source messaging application built for small to medium-sized teams. It provides persistent chat rooms, private messaging, and collaboration tools, prioritizing ease of deployment and control over your data.

Whaller is a secure and private team collaboration platform that enables organizations to create their own internal social networks, ensuring data privacy and control away from public social media platforms. It offers a comprehensive suite of tools for communication, file sharing, task management, and project organization.

Hibox is an all-in-one collaboration platform combining task management, team chat, video conferencing, and integrated file sharing. Designed for businesses of all sizes, it streamlines communication and project workflows within a single intuitive interface, eliminating the need for multiple disparate tools.

Conversations is a privacy-focused, open-source XMPP/Jabber client for Android. It offers robust end-to-end encryption using OMEMO and OTR, supports modern XMPP extensions, and provides a secure, decentralized messaging experience without relying on proprietary servers. It's an ideal choice for users prioritizing security and open standards.

TribeScale is an all-in-one platform designed to streamline team coordination, encompassing communication, goal management, task delegation, and progress tracking to enhance productivity and alignment within organizations.

Priority Matrix is a dynamic project and task management solution inspired by the Eisenhower Matrix, designed to help individuals and teams effectively prioritize work based on urgency and importance. Available across multiple platforms, it facilitates streamlined workflows and enhanced productivity.

Yammer is an enterprise social networking service designed for private communication within organizations, fostering open collaboration and knowledge sharing across departments and teams.

Flock is a comprehensive communication and collaboration platform designed for teams. It streamlines workflow and enhances productivity through integrated messaging, project management tools, and seamless file sharing within a secure environment.

Grape is a powerful and flexible API framework for Ruby, simplifying the development of REST-like APIs. Designed to run on Rack, it seamlessly complements existing web frameworks like Rails or Sinatra, providing a clean domain-specific language (DSL) for building robust and well-structured APIs.

Fleep is a business communication platform designed for teams of all sizes, facilitating collaboration within and across organizations through a combination of chat, task management, and file sharing.

Zulip is a powerful open-source group chat application designed for team collaboration. It uniquely structures conversations around topics, enabling users to easily catch up on important discussions and manage information overload. Zulip facilitates secure communication with integrated file sharing and various integrations.

Jostle is a modern intranet and employee engagement platform designed to connect, align, and engage every employee. It offers a central hub for communication, knowledge sharing, and collaboration, fostering a strong company culture and improving internal communication.

kune is a distributed social network and collaboration platform designed for privacy and freedom of speech. It offers features like group chat, file sharing, task management, and real-time collaboration, operating on a decentralized architecture.

Flowdock is a collaborative team workspace combining group chat, inbox, and integrated tool notifications. It streamlines communication and information flow for agile teams, connecting conversations with project management and code development tools like GitHub, Jira, and Trello.

Wickr is a secure and private instant messaging platform designed for individuals and teams who prioritize confidentiality. It offers end-to-end encryption, self-destructing messages, and a focus on anonymity to ensure that conversations and shared data remain protected.

Gitter is a free and open-source instant messaging and chat service designed specifically for developers and users of GitHub projects. It provides real-time communication within the context of software development teams and communities.

Dialog Messenger is a robust, feature-rich enterprise messaging solution designed for businesses prioritizing security, privacy, and control. Available for both private server deployment and cloud hosting, it facilitates secure text, voice, and video communication across multiple devices, enabling seamless collaboration and real-time interaction within organizations.

Hack Chat is a refreshingly simple and open-source chat application designed for immediate, no-nonsense communication. Forget complex sign-ups and cluttered interfaces; Hack Chat gets you talking instantly in various channels.

Stackfield is a comprehensive team collaboration platform designed for businesses requiring high levels of security. It integrates project management, task tracking, document sharing, group chat, and file management, all protected by end-to-end encryption. This ensures sensitive business data remains confidential and secure while enabling seamless team productivity.

Hubgets transforms team communication with integrated chat, voice, and video, fostering collaboration and boosting productivity through a unified platform for messaging, file sharing, and project management.