An open-source office suite you run on your own server.
Spreadsheets · Documents · File manager — real-time co-editing, .xlsx / .docx round-trip, no vendor lock-in.
| Product | What it is | Status |
|---|---|---|
| sheets | Web spreadsheet with .xlsx fidelity and y-websocket co-editing. React + Univer + TypeScript on the front, Bun-based snapshot worker on the back. | live demo at sheet.casualoffice.org |
| docs | WYSIWYG .docx editor with ProseMirror schema and OOXML-preserving layout. Real-time co-editing via Yjs; Go gateway behind it. | live demo at docs.casualoffice.org |
| drive | Self-hosted file manager that opens .xlsx and .docx inline in the editors above. Rust + Axum + OpenDAL + WOPI. | live demo at drive.casualoffice.org |
| univer-revamp | Internal fork of the Univer Sheets engine with patches the sheets product depends on. | tracked upstream |
Beyond the document apps, we're building a remote-access platform — a different kind of product, but the same open, self-hostable, security-first philosophy:
| Product | What it is | Status |
|---|---|---|
| RASystem | Casual RAS — a white-label, embeddable remote-access platform. Vendors embed it to add secure screen viewing, remote keyboard/mouse control, clipboard/file/chat, and multi-user collaboration under their own brand. Rust core + a desktop app (share + connect); SDKs later. Peer-to-peer over iroh/QUIC. | alpha, at ras.casualoffice.org |
Casual RAS is security-first by design: signed PASETO session grants, per-message capability enforcement, local consent before any access, an always-visible in-session indicator, an emergency stop, and a hash-chained audit journal. It is alpha — hardening toward production, with on-device Linux/Windows verification, signed installers, and SDK extraction still in progress. Not yet production-ready.
If you've used Google Workspace or Microsoft 365 and want the same UX without the data-handover, this is the same shape, self-hosted:
- Sheets → Google Sheets / Excel Online
- Docs → Google Docs / Word Online
- Drive → Google Drive / OneDrive
Every product opens the canonical Microsoft format directly (.xlsx, .docx) — no proprietary container, no one-way export.
- Frontend — React 18/19, TypeScript, Tailwind / IBM Plex Sans + JetBrains Mono.
Sheets is on Univer (forked at univer-revamp);
docs is a ProseMirror schema with a custom layout painter that preserves OOXML;
drive is a Vite SPA embedded into a Rust binary via
rust-embed. - Backend — Go gateways for the realtime y-websocket / CRDT layer (docs). Rust + Axum for the drive control plane. Storage is pluggable per product (inline / WOPI / JWT-API host).
- Realtime — Yjs + y-websocket, with per-document rooms drained back to host storage on disconnect. The gateway holds no on-disk state.
Each product ships a Docker image and a docker-compose for the demo stack — check that product's README for the current step-by-step. Drive is the recommended entry point if you want one process that orchestrates the others.
We welcome contributors — the whole suite is Apache-2.0 and built in the open.
Bug reports, feature ideas, and pull requests are all welcome. For larger
changes, open an issue to discuss first; otherwise feel free to raise a PR
against the relevant repo. See each repo's CONTRIBUTING guide to get started.
Apache-2.0 across the suite — sheets, docs, drive, and the univer-revamp fork. Permissive use; you can self-host and modify freely.
- Web: casualoffice.org
- Issues + discussions live in each repo above.