Kubuno

A safe home for all your data - your cloud, your rules.

Self-hosted, libre (AGPLv3) cloud platform with a modular architecture - a sovereign, community-driven alternative to Google Workspace and Microsoft 365.

One platform, 20+ apps: an office suite, files, mail, calendar, chat and meetings, a creative suite, a no-code app builder, automation, an AI assistant… all running on your server.

Kubuno is a complete cloud platform you run yourself. Instead of renting your email, documents, photos and files from a Big Tech vendor, you host them - on a home server, a VPS or a company rack - and keep full ownership and control.

It is built as a small core (the platform's "operating system") plus a constellation of independent apps. The core handles accounts, authentication, storage, real-time events, administration and proxying; each app is its own process and its own repository, so you install only what you need and the platform grows without ever becoming a monolith.

• Truly modular - every app is an independent process that registers with the core at startup. Install, update or remove apps from the administration console; nothing is hard-wired.
• Your data, your rules - 100% self-hosted, no third-party service required, no telemetry.
• Administered like an organisation - organisational units with inherited, lockable settings, groups, delegated admin roles, audit log, security dashboard, alerts, rules and printable reports.
• Secure by default - Argon2id password hashing, short-lived JWTs with HttpOnly refresh cookies, AES-256-GCM for data at rest, a tamper-evident audit chain, account lockout and anti-DDoS hardening, and a seccomp sandbox that forbids process execution inside apps.
• Fast & lean - a Rust + Axum backend on the database you choose: PostgreSQL, MySQL/MariaDB or SQLite (a couple of apps still require PostgreSQL). The database also carries the event bus and the job queue - no Redis, no extra broker.
• One consistent interface - a single React 19 host loads every app at runtime through an import map and shared libraries (@kubuno/sdk, @kubuno/ui), so all apps share one shell, one design system and one theme.
• Runs anywhere - native packages for the core on Linux, Windows and macOS, a one-command Docker image, and self-contained .kbpkg app packages installed identically on every platform.
• Truly international - 13 languages out of the box, right-to-left included.

Everything starts with the core - the platform's "operating system", and the only piece every installation needs. It is the server your users sign in to and the web interface they use; the apps plug into it.

	Repository	What it does
	core	Accounts and sign-in (passwords, SSO/OIDC, LDAP), organisational units, groups and roles, storage and quotas, real-time events, the administration console, app installation and updates, and the web interface that hosts every app

The core also publishes the libraries the apps are built on: the shared Rust crates (database, storage, sandbox, module authentication) and the @kubuno/ui, @kubuno/sdk and @kubuno/drive packages on npm.

	App	Repository	What it does
	Office	office	Full suite - Documents, Spreadsheets, Presentations, Projects, Diagrams, Data, Maths, Script and Whiteboard, with real-time co-editing
	Drive	drive	Files - upload, sharing, search, versions, previews and remote mounts
	Calendar	calendar	Calendars, invitations, meeting rooms, booking pages and CalDAV
	Tasks	tasks	Task lists, sub-tasks and Kanban boards (CalDAV VTODO)
	Notes	notes	Markdown notes, checklists, notebooks and backlinks
	Contacts	contacts	Address book, groups and the organisation directory (CardDAV)
	Forms	forms	Forms and surveys, with response analysis

	App	Repository	What it does
	Mail	mail	Multi-account mail client (IMAP/SMTP) with labels, filters and spam filtering
	Chat	chat	Messaging, voice and video calls, and meetings
	Forum	forum	Discussion boards with categories, topics, ranks and moderation

	App	Repository	What it does
	PaintSharp	paintsharp	Creative suite - raster, vector, video, animation, PDF and font editors
	Photos	photos	Photo library - albums, timeline and sharing
	Media	media	Streaming - films and series (Watch) and music (Listen)
	Books	books	Library of books, comics and e-books

	App	Repository	What it does
	Wiki	wiki	Collaborative wiki - wikitext, templates, namespaces and categories
	App	app	Visual no-code builder for complete web applications
	Flow	flow	Visual workflow automation with native Kubuno connectors
	Code	code	Collaborative web IDE with Git

	App	Repository	What it does
	KeeStore	keestore	Password manager - KeePass 4 (.kdbx) vaults encrypted client-side
	Maps	maps	Self-hosted maps - routes, saved places and tracks
	Assistant	assistant	AI assistant running local models, with custom agents

Frontend host (React 19) ── import map ──► apps loaded at runtime (/modules/<id>/entry.js)
        │
Core (Rust / Axum)  ── reverse proxy · events · auth · storage · admin ──►  apps (separate processes)
        │
Database - PostgreSQL, MySQL/MariaDB or SQLite (one namespace per app · events · job queue)

The core is the platform's operating system. Each app lives in its own repository and ships as a self-contained .kbpkg package that the core installs itself. Apps depend on Kubuno's shared Rust crates (tagged git dependencies) and frontend libraries (@kubuno/* on npm), never on the core directly - they talk to it over HTTP and well-defined extension points, so they stay genuinely independent.

• desktop - a file sync engine (kubuno-sync, Rust) with offline outbox, conflict handling and live watch mode, usable as a library, a CLI daemon or a cross-platform desktop app.
• api-spec - the OpenAPI specification and generated clients for building native apps.

The quickest way to a complete instance is the all-in-one Docker image:

docker pull ghcr.io/kubuno/kubuno:latest

Prefer a native install? The core ships packages for Debian/Ubuntu (.deb), Fedora/RHEL/openSUSE (.rpm), Windows (installer) and macOS (.pkg) on its Releases page. Then add the apps you want from the administration console, or install a downloaded .kbpkg:

sudo kubuno modules:install <app>-<version>-<os>-<arch>.kbpkg

Building from source requires Rust ≥ 1.82, Node.js ≥ 24 and a database (PostgreSQL 16, MySQL/MariaDB or SQLite) - each repository's README explains its own build.

Contributions are welcome - code, translations, design, testing, docs. Open an issue on the relevant repository to discuss any significant change before submitting a pull request. New to the project? The core is the best place to start reading.

Everything is AGPL-3.0-or-later © Kubuno contributors.