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OpenSourceAlternatives

Microsoft Teams alternatives

3 projects to consider for your Microsoft Teams workflows.

3 open source

Explore Campfire, Colanode and Element. Each takes a different approach to your Microsoft Teams workflows. Read its capabilities and limitations to find the right fit.

Catalogue facts checked August 31, 2026

Campfire

Self-hosted group chat with rooms, DMs, and @mentions

Open sourceMITSelf-hosted

Small teams, non-profits, and communities that want to own their chat data will get the most from Campfire. Its self-hosted rooms, direct messages, full-text search, attachments, and installable mobile app cover everyday team chat, and the MIT code now costs nothing to licence. Teams with nobody to run a server, and organizations needing documented SSO or compliance exports, should stay on managed chat instead. If you can operate one Linux server, self-host Campfire; if not, keep paying Slack or Teams for that convenience.[1][2]

Good fit. Small teams that want to own their chat data: MIT code plus SQLite on your own server means the archive lives with you, not with a vendor.[1][2]

Keep in mind. Teams with nobody to run a server: someone must provision the machine, hold the domain, and handle updates and backups, since no vendor-managed hosting exists.[1][2]

Repository review signals: unknown status, very stale · Observed October 3, 2026.

Sources and editorial review

Source research. Reviewed on October 9, 2026. Written by Sanjib Sah. AI assisted; reviewed by a human editor.

We have not run or tested this product.

Repository-published signal plus one directory listing: the README's printed 4,600+ stars and 775 forks with an open invitation to issues and discussions, and an Alternativeto listing with platform tags only. No original Reddit or G2 user reports were accessible in this pass (direct Reddit reads failed; the G2 page showed no Campfire-specific reviews), so no sentiment or prevalence inference is possible and no user experience is quoted.

  1. ONCE Campfire: pay once, use it forever

    official · Observed October 9, 2026

    ONCE Campfire product page: one-time pricing history ($299 struck through to $0 since September 2025), 8 users included, $150 10-user packs text, 30-day trial, self-hosting on own domain with Ubuntu and Nginx, Rails 8 plus SQLite 2026 rebuild, forums and email support, affiliate and student terms.

  2. basecamp/once-campfire repository

    official · Observed October 9, 2026

    Official repository README: MIT licence, Ruby 3.4.5 and Rails 8.0.2 stack, Kamal deployment, full feature list (rooms, DMs, mentions, search, saved searches, attachments, dark mode, audit log, spam blocking, PWA, push, bots), v1.5.1 release line, printed 4,600+ stars and 775 forks, open invitation to issues and discussions.

  3. ONCE Campfire directory listing

    community · Observed October 9, 2026

    Third-party directory listing for ONCE Campfire: short product description and platform tags (Mac, Windows, Linux, Android, iPhone, iPad, self-hosted). Used only as a listing-existence signal; directory copy is not product evidence and carries no user review.

Colanode

Local-first workspace combining chat, pages, databases, and files.

Open sourceApache-2.0Self-hostedManaged hosting

Small and mid-size teams that want a self-hostable Notion-and-Slack combination with local-first sync benefit most from Colanode: chat, pages, databases with table, kanban, and calendar views, and files live in one workspace, free on Seed or flat-rate through Titan with unlimited users. The constraint is maturity: the repository's last push was April 2026, so verify current maintenance activity, and confirm the undocumented SSO, SLA, and public-API gaps before committing.[1][2][3]

Good fit. Privacy-conscious small and mid-size teams: one workspace covers chat, docs, databases, and files with a self-host option and flat-rate cloud tiers that do not charge per seat.[1][2]

Keep in mind. Adopters needing evidence of active maintenance should check current activity first: repository metadata observed October 9, 2026 shows the last push in April 2026, about six months before this review, with 47 open issues.[1]

Repository review signals: unknown status, very stale · Observed October 3, 2026.

Sources and editorial review

Source research. Reviewed on October 9, 2026. Written by Sanjib Sah. AI assisted; reviewed by a human editor.

We have not run or tested this product.

  1. Colanode official site

    official · Observed October 9, 2026

    Official homepage: local-first Slack and Notion positioning, CRDT sync, chat, pages, databases with three views, files, shareable workspaces, desktop and web clients, cloud and self-host choice.

  2. Colanode Cloud pricing

    official · Observed October 9, 2026

    Official pricing page: Seed free tier with 10 GB storage and 100 MB max file; Forge $20 with 50 GB; Scale $100 with 300 GB; Titan $500 with 2 TB; all tiers all features and unlimited users; enterprise by contact.

  3. colanode/colanode repository metadata

    official · Observed October 9, 2026

    Repository metadata: created July 2024, last push April 2026, about 5,160 stars and 327 forks at observation, 47 open issues, not archived.

Element

End-to-end encrypted team messenger built on Matrix

Open sourceAGPL-3.0Self-hostedManaged hosting

Teams that need encrypted, self-sovereign chat get the most from Element: its Matrix-based messenger pairs default end-to-end encryption and federated rooms with free open-source apps plus a choice of self-hosting or managed Element hosting. The decisive trade is operational: running a homeserver takes real IT work, so teams that want zero-overhead managed chat should stay with an incumbent such as Microsoft Teams.[1][2]

Good fit. Security-conscious organisations that need data ownership: end-to-end encryption plus self-hosting or managed hosting keeps sensitive conversation data under their own control.[1][2]

Keep in mind. Teams wanting zero-operational-overhead chat: running the full stack means operating a Matrix homeserver, which takes more work than signing up for a hosted service.[1]

Repository review signals: unknown status, very stale · Observed October 3, 2026.

Sources and editorial review

Source research. Reviewed on October 9, 2026. Written by Sanjib Sah. AI assisted; reviewed by a human editor.

We have not run or tested this product.

  1. Element homepage (official)

    official · Observed October 9, 2026

    Official homepage: Matrix-based secure collaboration, E2EE by default, federation, self-host or EMS hosting, enterprise suite features, Teams-alternative positioning.

  2. Element enterprise pricing (official)

    official · Observed October 9, 2026

    Official enterprise pricing page: Pro/Enterprise tiers, SSO/LDAP, audit, retention, SLA, air-gapped deployment, free trial, free open-source apps.

Compare Microsoft Teams alternatives

Known catalogue facts at a glance. Columns with no reviewed values are omitted. “Not reviewed” means unknown, not that a capability is absent.

Known facts for Microsoft Teams alternatives
ProjectLicense policyHostingDeploymentOfflineEnterprise supportBest fit
CampfireMIT · OSI-approvedSelf-hostedeasyNot reviewedNot reviewedInternal team chat; Community and event chat
ColanodeApache-2.0 · OSI-approvedSelf-hosted + ManagedmoderateYesNot reviewedTeam chat; Shared wikis and notes
ElementAGPL-3.0 · OSI-approvedSelf-hosted + ManagedmoderateNot reviewedYesSecure team messaging; Government and public-sector communication

Before you switch

  • Check that the project covers the workflows and data you need to move.
  • Confirm that the license terms fit how you plan to run, modify, and distribute it.
  • Choose between self-hosting responsibility and a reviewed managed option.
  • Open the project page for repository freshness, review dates, and any unresolved requirements.
About Microsoft Teams

Teams wins on bundling rather than on craft. If an organisation already pays for Microsoft 365, Teams arrives at no additional cost with identity, files, and calendar already wired together.

Chat and meetings are competent, and the file experience is genuinely strong because SharePoint is underneath. The interface carries the weight of everything it integrates with, and it shows.

Microsoft · Free tier, included with Microsoft 365 from $4/user/month · Checked August 31, 2026

Official website
How this list is ordered

Recommended · Organic catalogue order.

A deterministic editorial score using relationship confidence, category fit, logarithmic popularity, as-of maintenance and freshness, with bounded anomaly quarantine and known-data penalties. Payment is fixed at zero.

Payment does not affect organic ranking. Order is a starting point, not a universal recommendation.

OpenAlternative organic alternatives v4 · version 4