Best Collaboration & Communication Tools in 2026

Baserow

Build databases and apps without coding

Stars
4,689
Forks
576
Last commit
13 hours ago

Open-source no-code platform for creating databases, applications, and workflows. Self-host or use cloud. GDPR, HIPAA, SOC 2 compliant with unlimited scalability.

Open Source Alternative to:

Airtable

Excalidraw

Collaborative whiteboarding with a hand-drawn feel

Stars
121,578
Forks
13,364
Last commit
21 hours ago

Excalidraw is a virtual whiteboard tool that allows teams to easily create and share sketches with a unique hand-drawn aesthetic.

Open Source Alternative to:

Miro

Affine

Collaborative knowledge creation and management platform

Stars
67,496
Forks
4,764
Last commit
18 hours ago

All-in-one workspace for note-taking, whiteboarding, and task management with real-time collaboration and local-first architecture.

Open Source Alternative to:

Notion

Plane

Open-source project management for modern teams

Stars
48,197
Forks
4,043
Last commit
1 day ago

Collaborative workspace for agile teams to plan, track, and ship projects with customizable workflows and powerful features.

Open Source Alternative to:

Linear

Rocket.Chat

Secure, flexible team communication platform

Stars
45,182
Forks
13,528
Last commit
14 hours ago

Open-source chat solution offering real-time messaging, video calls, and file sharing for teams of all sizes.

Open Source Alternative to:

Discord

Tldraw

Free instant collaborative whiteboarding for all devices

Stars
46,438
Forks
3,153
Last commit
19 hours ago

Create, collaborate, and brainstorm instantly with this free virtual whiteboard. No signup needed. Works seamlessly on mobile, tablet, and desktop devices.

Open Source Alternative to:

Miro

Mattermost

Secure collaboration platform for mission-critical work

Stars
36,295
Forks
8,543
Last commit
11 hours ago

Mattermost provides a flexible, open-source platform for secure team collaboration, designed for organizations with strict security and privacy requirements.

Open Source Alternative to:

Microsoft Teams

Nextcloud

Secure cloud collaboration platform for organizations

Stars
34,675
Forks
4,833
Last commit
11 hours ago

Nextcloud offers on-premises file sync, sharing and collaboration platform with advanced security and privacy features.

Open Source Alternative to:

Microsoft Teams

Jitsi

Private, secure video calls with no account needed

Stars
29,049
Forks
7,869
Last commit
14 hours ago

Host encrypted video conferences directly in your browser, deploy on your own servers, or integrate into applications - all with this powerful open source platform.

Open Source Alternative to:

Microsoft Teams

Zulip

Organized team chat for distributed teams

Stars
25,054
Forks
9,792
Last commit
15 hours ago

Zulip is an open-source team chat app that uses threaded conversations to keep communication organized and efficient for teams of all sizes.

Open Source Alternative to:

Microsoft Teams

Focalboard

Organize, plan, and collaborate with visual boards

Stars
26,061
Forks
2,528
Last commit
1 day ago

Open-source project management tool for teams. Create kanban boards, tables, and tasks to streamline workflows and boost productivity.

Open Source Alternative to:

Linear

Huly

Unified workspace for seamless team collaboration

Stars
25,409
Forks
1,837
Last commit
1 day ago

An open-source platform that combines project management, team communication, document collaboration, and virtual office spaces in one integrated solution.

Open Source Alternative to:

Notion

Teable

Flexible database meets intuitive spreadsheet interface

Stars
21,152
Forks
1,257
Last commit
12 hours ago

Open-source platform combining powerful database capabilities with a user-friendly spreadsheet interface for efficient data management and collaboration.

Open Source Alternative to:

Airtable

Docs

Create, edit and share documents with real-time collaboration

Stars
16,413
Forks
575
Last commit
1 day ago

Transform document collaboration with real-time editing, version control, and secure sharing features that enhance team productivity and communication.

Open Source Alternative to:

Notion

Element

Secure, decentralized messaging for teams and individuals

Stars
13,004
Forks
2,568
Last commit
18 hours ago

Open-source platform for encrypted communication, file sharing, and collaboration based on the Matrix protocol.

Open Source Alternative to:

Discord

Fluxer

Open source messaging with privacy and community focus

Stars
8,318
Forks
468
Last commit
12 days ago

Free, open-source instant messaging and VoIP platform with full Markdown support, voice/video calls, moderation tools, and self-hosting options for communities.

Open Source Alternative to:

Discord

CryptPad

Secure collaboration with end-to-end encryption

Stars
7,513
Forks
811
Last commit
23 hours ago

Open-source collaboration suite offering encrypted document editing, file sharing, and team workspaces with complete privacy protection.

Open Source Alternative to:

Microsoft 365

ONLYOFFICE Docs

Complete office suite for documents, spreadsheets & more

Stars
6,448
Forks
1,269
Last commit
2 months ago

Open-source online editor for documents, spreadsheets, presentations, and PDFs. Features real-time collaboration, AI integration, and accessibility tools.

Open Source Alternative to:

Microsoft 365

Campfire

Self-hosted group chat without recurring subscription fees

Stars
4,281
Forks
718
Last commit
8 days ago

Install your own group chat system with @mentions, DMs, and mobile support. One-time purchase, no monthly fees. Includes full source code for customization.

Open Source Alternative to:

Microsoft Teams

Colanode

Self-hosted workspace combining chat, docs, and files

Stars
4,761
Forks
290
Last commit
18 days ago

Open-source collaboration platform combining real-time chat, document editing, file sharing, and project management. Self-host for complete control.

Open Source Alternative to:

Notion

Workadventure

Virtual office platform for engaging remote collaboration

Stars
5,399
Forks
853
Last commit
22 hours ago

Create customizable virtual workspaces for remote teams to interact naturally, host events, and collaborate through spontaneous conversations and scheduled meetings.

Open Source Alternative to:

Microsoft Teams

Cinny

Secure and elegant Matrix client for seamless conversations

Stars
3,571
Forks
506
Last commit
17 hours ago

Cinny offers a simple, elegant, and secure interface for Matrix-based conversations, protected by end-to-end encryption.

Open Source Alternative to:

Discord

LibreOffice

Free office suite with Microsoft compatibility

Stars
3,865
Forks
817
Last commit
11 hours ago

Complete free office suite compatible with Microsoft formats (.doc, .docx, .xls, .xlsx, .ppt, .pptx). Open source alternative with regular updates.

Open Source Alternative to:

Microsoft 365

Stoat

Privacy-first chat app with customizable interface

Stars
2,967
Forks
343
Last commit
12 hours ago

Modern chat platform featuring text channels, community building tools, fine-grained permissions, and complete privacy protection. Open-source and ad-free.

Open Source Alternative to:

Discord

Wire

Secure collaboration platform with end-to-end encryption

Stars
2,534
Forks
179
Last commit
4 months ago

A comprehensive collaboration platform offering end-to-end encrypted messaging, file sharing, and video calls with enterprise-grade security and compliance features.

Open Source Alternative to:

Discord

UnInbox

Transform team email into efficient collaborative workflows

Stars
1,719
Forks
129
Last commit
2 months ago

Streamline team communication with shared inboxes, unlimited email addresses, and customizable workflows. Perfect for modern businesses seeking organized email management.

Open Source Alternative to:

Microsoft Teams

Mezon

Create custom spaces to chat, game, and connect globally

Stars
1,481
Forks
46
Last commit
13 hours ago

Build your own community space for gaming, chatting, and hanging out with friends worldwide. Customize your environment for the perfect social experience.

Open Source Alternative to:

Discord

Sync-in

Open-source file storage with complete data sovereignty

Stars
1,033
Forks
47
Last commit
18 hours ago

Secure, open-source platform for file storage, sharing, and collaboration. Host your data on your own infrastructure with full control and transparency.

Open Source Alternative to:

Google Drive

Ever Teams

Real-time work and project management platform

Stars
499
Forks
96
Last commit
4 days ago

Ever Teams offers an all-in-one solution for work management, time tracking, and team collaboration with integrations for popular tools.

Open Source Alternative to:

Linear

dDocs

End-to-end encrypted collaborative document editor

Stars
200
Forks
23
Last commit
15 hours ago

Write, organize, and collaborate in real-time with complete privacy and security. This app is an open-source, online/offline compatible, and AI-free alternative to Google Docs.

Open Source Alternative to:

Microsoft Word

Twake Chat

Secure open source messaging for professional teams

Stars
151
Forks
42
Last commit
14 hours ago

Free Matrix-based messenger with end-to-end encryption, multi-platform bridges, and on-premise deployment. Connect across 30+ networks securely.

Open Source Alternative to:

Microsoft Teams

Baserow

Build databases and apps without coding

Stars
4,689
Forks
576
Last commit
13 hours ago

Open-source no-code platform for creating databases, applications, and workflows. Self-host or use cloud. GDPR, HIPAA, SOC 2 compliant with unlimited scalability.

Open Source Alternative to:

Airtable

Excalidraw

Collaborative whiteboarding with a hand-drawn feel

Stars
121,578
Forks
13,364
Last commit
21 hours ago

Excalidraw is a virtual whiteboard tool that allows teams to easily create and share sketches with a unique hand-drawn aesthetic.

Open Source Alternative to:

Miro

Affine

Collaborative knowledge creation and management platform

Stars
67,496
Forks
4,764
Last commit
18 hours ago

All-in-one workspace for note-taking, whiteboarding, and task management with real-time collaboration and local-first architecture.

Open Source Alternative to:

Notion

Plane

Open-source project management for modern teams

Stars
48,197
Forks
4,043
Last commit
1 day ago

Collaborative workspace for agile teams to plan, track, and ship projects with customizable workflows and powerful features.

Open Source Alternative to:

Linear

Rocket.Chat

Secure, flexible team communication platform

Stars
45,182
Forks
13,528
Last commit
14 hours ago

Open-source chat solution offering real-time messaging, video calls, and file sharing for teams of all sizes.

Open Source Alternative to:

Discord

Tldraw

Free instant collaborative whiteboarding for all devices

Stars
46,438
Forks
3,153
Last commit
19 hours ago

Create, collaborate, and brainstorm instantly with this free virtual whiteboard. No signup needed. Works seamlessly on mobile, tablet, and desktop devices.

Open Source Alternative to:

Miro

Mattermost

Secure collaboration platform for mission-critical work

Stars
36,295
Forks
8,543
Last commit
11 hours ago

Mattermost provides a flexible, open-source platform for secure team collaboration, designed for organizations with strict security and privacy requirements.

Open Source Alternative to:

Microsoft Teams

Nextcloud

Secure cloud collaboration platform for organizations

Stars
34,675
Forks
4,833
Last commit
11 hours ago

Nextcloud offers on-premises file sync, sharing and collaboration platform with advanced security and privacy features.

Open Source Alternative to:

Microsoft Teams

Jitsi

Private, secure video calls with no account needed

Stars
29,049
Forks
7,869
Last commit
14 hours ago

Host encrypted video conferences directly in your browser, deploy on your own servers, or integrate into applications - all with this powerful open source platform.

Open Source Alternative to:

Microsoft Teams

Zulip

Organized team chat for distributed teams

Stars
25,054
Forks
9,792
Last commit
15 hours ago

Zulip is an open-source team chat app that uses threaded conversations to keep communication organized and efficient for teams of all sizes.

Open Source Alternative to:

Microsoft Teams

Focalboard

Organize, plan, and collaborate with visual boards

Stars
26,061
Forks
2,528
Last commit
1 day ago

Open-source project management tool for teams. Create kanban boards, tables, and tasks to streamline workflows and boost productivity.

Open Source Alternative to:

Linear

Huly

Unified workspace for seamless team collaboration

Stars
25,409
Forks
1,837
Last commit
1 day ago

An open-source platform that combines project management, team communication, document collaboration, and virtual office spaces in one integrated solution.

Open Source Alternative to:

Notion

Teable

Flexible database meets intuitive spreadsheet interface

Stars
21,152
Forks
1,257
Last commit
12 hours ago

Open-source platform combining powerful database capabilities with a user-friendly spreadsheet interface for efficient data management and collaboration.

Open Source Alternative to:

Airtable

Docs

Create, edit and share documents with real-time collaboration

Stars
16,413
Forks
575
Last commit
1 day ago

Transform document collaboration with real-time editing, version control, and secure sharing features that enhance team productivity and communication.

Open Source Alternative to:

Notion

Element

Secure, decentralized messaging for teams and individuals

Stars
13,004
Forks
2,568
Last commit
18 hours ago

Open-source platform for encrypted communication, file sharing, and collaboration based on the Matrix protocol.

Open Source Alternative to:

Discord

Fluxer

Open source messaging with privacy and community focus

Stars
8,318
Forks
468
Last commit
12 days ago

Free, open-source instant messaging and VoIP platform with full Markdown support, voice/video calls, moderation tools, and self-hosting options for communities.

Open Source Alternative to:

Discord

CryptPad

Secure collaboration with end-to-end encryption

Stars
7,513
Forks
811
Last commit
23 hours ago

Open-source collaboration suite offering encrypted document editing, file sharing, and team workspaces with complete privacy protection.

Open Source Alternative to:

Microsoft 365

ONLYOFFICE Docs

Complete office suite for documents, spreadsheets & more

Stars
6,448
Forks
1,269
Last commit
2 months ago

Open-source online editor for documents, spreadsheets, presentations, and PDFs. Features real-time collaboration, AI integration, and accessibility tools.

Open Source Alternative to:

Microsoft 365

Campfire

Self-hosted group chat without recurring subscription fees

Stars
4,281
Forks
718
Last commit
8 days ago

Install your own group chat system with @mentions, DMs, and mobile support. One-time purchase, no monthly fees. Includes full source code for customization.

Open Source Alternative to:

Microsoft Teams

Colanode

Self-hosted workspace combining chat, docs, and files

Stars
4,761
Forks
290
Last commit
18 days ago

Open-source collaboration platform combining real-time chat, document editing, file sharing, and project management. Self-host for complete control.

Open Source Alternative to:

Notion

Workadventure

Virtual office platform for engaging remote collaboration

Stars
5,399
Forks
853
Last commit
22 hours ago

Create customizable virtual workspaces for remote teams to interact naturally, host events, and collaborate through spontaneous conversations and scheduled meetings.

Open Source Alternative to:

Microsoft Teams

Cinny

Secure and elegant Matrix client for seamless conversations

Stars
3,571
Forks
506
Last commit
17 hours ago

Cinny offers a simple, elegant, and secure interface for Matrix-based conversations, protected by end-to-end encryption.

Open Source Alternative to:

Discord

LibreOffice

Free office suite with Microsoft compatibility

Stars
3,865
Forks
817
Last commit
11 hours ago

Complete free office suite compatible with Microsoft formats (.doc, .docx, .xls, .xlsx, .ppt, .pptx). Open source alternative with regular updates.

Open Source Alternative to:

Microsoft 365

Stoat

Privacy-first chat app with customizable interface

Stars
2,967
Forks
343
Last commit
12 hours ago

Modern chat platform featuring text channels, community building tools, fine-grained permissions, and complete privacy protection. Open-source and ad-free.

Open Source Alternative to:

Discord

Wire

Secure collaboration platform with end-to-end encryption

Stars
2,534
Forks
179
Last commit
4 months ago

A comprehensive collaboration platform offering end-to-end encrypted messaging, file sharing, and video calls with enterprise-grade security and compliance features.

Open Source Alternative to:

Discord

UnInbox

Transform team email into efficient collaborative workflows

Stars
1,719
Forks
129
Last commit
2 months ago

Streamline team communication with shared inboxes, unlimited email addresses, and customizable workflows. Perfect for modern businesses seeking organized email management.

Open Source Alternative to:

Microsoft Teams

Mezon

Create custom spaces to chat, game, and connect globally

Stars
1,481
Forks
46
Last commit
13 hours ago

Build your own community space for gaming, chatting, and hanging out with friends worldwide. Customize your environment for the perfect social experience.

Open Source Alternative to:

Discord

Sync-in

Open-source file storage with complete data sovereignty

Stars
1,033
Forks
47
Last commit
18 hours ago

Secure, open-source platform for file storage, sharing, and collaboration. Host your data on your own infrastructure with full control and transparency.

Open Source Alternative to:

Google Drive

Ever Teams

Real-time work and project management platform

Stars
499
Forks
96
Last commit
4 days ago

Ever Teams offers an all-in-one solution for work management, time tracking, and team collaboration with integrations for popular tools.

Open Source Alternative to:

Linear

dDocs

End-to-end encrypted collaborative document editor

Stars
200
Forks
23
Last commit
15 hours ago

Write, organize, and collaborate in real-time with complete privacy and security. This app is an open-source, online/offline compatible, and AI-free alternative to Google Docs.

Open Source Alternative to:

Microsoft Word

Twake Chat

Secure open source messaging for professional teams

Stars
151
Forks
42
Last commit
14 hours ago

Free Matrix-based messenger with end-to-end encryption, multi-platform bridges, and on-premise deployment. Connect across 30+ networks securely.

Open Source Alternative to:

Microsoft Teams

Open Source Collaboration & Communication Tools

A curated collection of the best open source tools facilitating team communication and collaboration.