Open-source Apple Numbers alternatives

Univer is an open-source SDK that lets you build office-style applications within your own product. It provides components for spreadsheet, document and presentation features, with no requirement to use a hosted app or a fixed interface. The architecture is plugin-based, with rendering on Canvas, a built-in formula engine and a single Facade API usable in browsers and on Node.js. It is written in TypeScript and released under the Apache-2.0 license.

Typical uses include adding spreadsheet or document editing to a SaaS product, an internal tool, a business intelligence workflow or an AI application, and running workbook or document processing on the server with the same architecture as in the browser. Plugins let you include just the capabilities you want, and presets offer a fast way to get going, and extend behavior with custom plugins, commands, services and UI components. The wider Univer family also covers bases, boards and PDFs, and Univer Workspace, a workspace you can host yourself, is built on the SDK as an open-source example. The README distinguishes the open-source scope from the Pro offering.

CryptPad is an open-source collaboration suite with end-to-end encryption. Documents are synchronized between collaborators in real time, and because user data is encrypted, an attacker who breaches the server cannot read the stored content. Administrators who run unmodified code and the service itself also cannot see what users store.

The encryption happens in the browser before data is sent to the server or to collaborators. The README is candid about a limit of this model: the code that does the encrypting is delivered by the host server, as on any website, so users must trust the administrator to keep the server secure. Repository topics mention collaborative editing, real-time work and the ChainPad algorithm.

CryptPad is written in JavaScript and licensed under AGPL-3.0. A developer guide covers setting up a local instance, and an admin guide covers production deployments. Official Docker images for AMD64 and ARM64 are published with every release, and a Dockerfile and docker-compose.yml are included in the repository.