Open-source Microsoft PowerPoint 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.

Collabora Online is an open-source, web-based office suite built on LibreOffice technology. It lets users open and edit documents in the browser, and the project's topics also reference mobile apps for iOS and Android. It is aimed at organizations that want document editing they can control, often integrated into other collaboration or file-sharing platforms.

This GitHub repository has a narrower role than the product as a whole. Active development and code review have moved to the project's own Gerrit instance, and the GitHub repository is kept for issue tracking and for release artifacts, including the nightly container image, the Helm chart and build assets. Pull requests are welcome only for the Helm chart and the Docker image build, and a read-only source mirror is available elsewhere.

Because the container image and Helm chart are published from here, the software is designed to be deployed on your own infrastructure, including Kubernetes. The code is a mix of C++, JavaScript and shell scripts. Contributors should follow the contributing guide and push source changes to Gerrit rather than GitHub.

slides-grab is a harness, editor and linter for creating presentations with AI coding agents. Slides are generated as plain HTML and CSS, which agents handle well, and you can select an area on a slide and ask the agent to change it, while simple tweaks such as text, size or bold can still be done by hand.

The project supports Claude Code and Codex and describes itself as an open-source alternative to Claude Design. Decks can be converted to PDF or to an experimental PPTX format. There is also a build for a ChatGPT plugin ZIP containing the published skills, though export, visual validation, the local editor and image generation need the local Node.js and Playwright runtime. A gallery of example presentations is available online.

The editor is a single JavaScript file, so adding new coding agents or changing designs is straightforward. The project requires Node.js 20 or newer, uses main as its only integration branch, and is licensed under MIT. It runs locally on your own machine with your own agent subscription. It suits developers and technical presenters who want AI-assisted decks they can version and edit as code.