Grist is a modern relational spreadsheet that combines the flexibility of a spreadsheet with the robustness of a database. The grist-core repository is the heart of Grist and serves as the basis for various options such as the grist-electron desktop app and the grist-static in-browser build. Grist offers unique features such as Python formulas, a portable format based on SQLite, conditional formatting, charts, and summary tables. It also supports integrations, sandboxing options, and multiple languages. Grist is free and open source, allowing users to modify the source code, increase trust, and maintain their data portability and autonomy.
https://github.com/gristlabs/grist-core