Excel is still the most capable spreadsheet ever shipped - decades of formulas, pivot tables, and now Python in the grid, plus a ubiquity that means everyone already knows how to open one. For ad hoc analysis it's unmatched. The trouble starts when a spreadsheet quietly becomes a system of record: there's nothing stopping a stray paste from corrupting a column, no real types, no enforced validation, and the file gets emailed around until five conflicting copies exist and the formulas in one of them are silently wrong.
The open source alternative below is for exactly that moment - when you need a spreadsheet's familiarity but a database's discipline. You keep formulas, including Python ones, but columns carry real types and validation, the data lives in one place instead of scattered file copies, and you self-host the whole thing so the source of truth sits on infrastructure you control rather than in an attachment.
Grist is a modern relational spreadsheet for organizing data in tables that behave like spreadsheets but keep database-like columns and references. It is meant for people who need spreadsheet workflows with more structure for records, formulas, and shared data.
ONLYOFFICE Docs is a free collaborative online office suite with viewers and editors for text documents, spreadsheets, presentations, forms, PDFs, and diagrams. It is fully compatible with Office Open XML formats - .docx, .xlsx, and .pptx - and supports real-time collaborative editing.
LibreOffice is an integrated office suite for personal productivity. It is compatible with most document formats and standards, and includes applications for writing documents, working with spreadsheets, creating drawings, and building presentations.
EtherCalc is a web spreadsheet for real-time collaborative editing. It is a TypeScript rewrite of a Node.js port of Multi-user SocialCalc, built to let people share a room URL and edit the same sheet together.
Carbone turns JSON data into finished documents. You design a template in LibreOffice, Google Docs, or Microsoft Office and drop in JSON-like markers such as {d.companyName}; Carbone fills the markers from your data and outputs PDF, DOCX, XLSX, ODT, PPTX, ODS, XML, or CSV. The data comes straight from your existing JSON APIs.
Nurse Scheduling System solves the nurse scheduling problem, where constraints vary widely between hospitals and wards and manual scheduling in spreadsheets can take many hours. It aims to model real-world scenarios in one flexible framework rather than an over-simplified constraint set.
