spreadsheet application
For an open source alternative to Excel, the strongest matches are collaboraonline/online (Collabora Online is a full-featured, web-based office suite built), onlyoffice/documentserver (ONLYOFFICE DocumentServer is a self-hosted online office suite that) and ironcalc/ironcalc (IronCalc is a self-hostable web-based spreadsheet engine that handles). gristlabs/grist-core is also worth a look. Each is ranked by relevance to your query, popularity and recent activity.
We curate open-source GitHub repositories matching “open source excel”. Results are ranked by relevance to your query — pick filters below to narrow, or refine with AI.
spreadsheet application
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- collaboraonline/online
CollaboraOnline/online
2,985View on GitHubThis project is a cloud-based office suite and self-hosted document server that enables the creation and editing of documents, spreadsheets, and presentations. It functions as a headless office application, utilizing a server-side processing engine to handle file rendering and formatting without requiring a local graphical user interface. The system operates as a real-time collaborative editor, employing operational transformation to allow multiple users to edit files simultaneously. It also serves as a web-based document processor capable of automating office tasks through macro execution an
Collabora Online is a full-featured, web-based office suite built on LibreOffice, providing a rich spreadsheet editor that supports formulas, charting, Excel import/export, macros, real-time collaboration, cross-platform browser access, conditional formatting, and pivot tables—making it a complete, self-hosted alternative to Microsoft Excel.
C++Real-Time Collaborative EditingReal-time Collaboration - onlyoffice/documentserver
ONLYOFFICE/DocumentServer
6,633View on GitHubONLYOFFICE DocumentServer is a self-hosted online office suite that provides browser-based document, spreadsheet, and presentation editing with real-time collaborative capabilities. It natively supports Office Open XML formats (.docx, .xlsx, .pptx) and can be deployed on Linux servers, either through Docker containerization or direct installation. The server includes a cooperative editing engine that coordinates simultaneous changes across multiple users using operational transformation, with a WebSocket synchronization layer for instant state propagation. Security is handled through JWT auth
ONLYOFFICE DocumentServer is a self-hosted online office suite that includes a real-time collaborative spreadsheet editor with native xlsx support, making it a solid open-source alternative to Excel, though you'll need to deploy it on a server and verify specific advanced features like pivot tables from its wider documentation.
ShellReal-Time Collaborative EditingReal-time Collaborative EditorsWeb-Based Spreadsheet Editors - ironcalc/ironcalc
ironcalc/IronCalc
3,750View on GitHubIronCalc is an XLSX spreadsheet engine and formula evaluator designed to compute numerical expressions and manage workbook structures. It utilizes a logic engine compatible with industry standards to evaluate formulas and manage cell dependencies. The project provides a comprehensive suite of specialized toolkits, including a financial calculation library for bond pricing and net present value, and an engineering math toolkit for complex number arithmetic and Bessel functions. It also features a web-based spreadsheet interface for creating and formatting workbooks. The engine covers a broad
IronCalc is a self-hostable web-based spreadsheet engine that handles XLSX import/export and formula evaluation, making it a usable alternative to Excel, but it currently lacks charting, pivot tables, and real-time collaboration.
RustConditional FormattingSpreadsheet Formula EnginesXLSX Serialization - gristlabs/grist-core
gristlabs/grist-core
11,176View on GitHubGrist is a relational spreadsheet platform that combines the flexibility of a spreadsheet with the power of a relational database. At its core, it manages structured data across multiple linked tables, using a relational database engine to organize information while providing a familiar grid interface. The platform supports Python-based formulas for complex calculations and data transformations, with automatic recalculation when referenced cells change. The system is designed for self-hosted deployment, storing data in either portable SQLite files or enterprise-grade PostgreSQL databases. It
Grist is a self-hosted relational spreadsheet platform that combines a familiar grid interface with Python-based formulas and database-backed data management, making it a genuine spreadsheet application and a viable alternative to Excel for structured data, though its charting and pivot-table capabilities are not explicitly featured in the description.
TypeScriptConditional Formatting
