formula-engine

🎮 TypeScript game numeric engine for RPG & strategy games. Zero dependencies, type-safe formula parsing, battle system simulation, and expression evaluation. 基于 TypeScript 的游戏数值引擎，专为 RPG 和策略游戏设计。零依赖、类型安全的公式解析、战斗系统模拟和表达式计算。

Formula workbooks for Node services: edit inputs, recalculate formulas, read outputs, persist WorkPaper JSON, and expose MCP tools.

Single-header C++ JIT compiler/evaluator for mathematical expressions

A spreadsheet engine you can put anywhere — a deterministic, embeddable Rust engine that reads and writes .xlsx (plus CSV/TSV/PSV) with a WASM canvas editor. Correctness, determinism, and fidelity before performance.

AI-native financial modeling — YAML models that LLMs read, write, and validate deterministically. 10-15x fewer tokens than Excel.

Visual data workbench for transforming and combining tabular data, surfacing suggestions for analyzing and cleaning data, building visualizations, and creating and exporting reports.

Benchmarking xlsx libraries against Microsoft Excel itself: load, round-trip, and recalculation fidelity across 16,000 real-world workbooks from two public corpora. witan · LibreOffice · EPPlus · ClosedXML · openpyxl

A reactive dependency graph engine with topological scheduling and cyclic convergence

Embeddable Excel-style spreadsheet: State + Transaction + Plugin (ProseMirror-style). TypeScript, Konva, formula engine, xlsx/CSV. npm @xexcel/react

Pure Go library for reading, writing, and evaluating ODS (OpenDocument Spreadsheet) files

Android Excel library for Kotlin — read/write .xlsx files with a native API. Lightweight alternative to Aspose.Cells at $99/year.

Text-canonical, collaborative, agent-friendly spreadsheet — the markdown IS the source of truth

Real-time collaborative spreadsheet editor with a custom formula engine, dependency graph recalculation, optimistic updates, and 50-state undo/redo over Socket.IO.

High-performance, lightweight .NET Standard 2.0 library for reading, writing, and streaming Excel and spreadsheet files (XLSX, XLS, XLSM, XLSB, CSV, TSV, HTML, XML 2003, JSON). Features native BIFF8 XLS support, zero-allocation streaming, automatic format detection, and a built-in Excel formula engine.

An embeddable spreadsheet UI whose core doesn't know where the data comes from — a three-method backend port, payload that follows the viewport rather than the workbook, and a Rust/WASM formula engine in a worker. MIT.

A cross-platform, canvas-based spreadsheet app for desktop.

React spreadsheet component with Excel (XLSX) and CSV import/export, a formula engine, and a virtualized editable grid. Zero runtime dependencies.

High-performance .NET Excel-compatible formula engine — 38 built-in functions, Roslyn-powered compilation, sandboxed execution, async API, and full nullable type support.

Free browser-based spreadsheet app — vanilla JS, formula engine, multi-sheet, CSV/JSON, dark theme

MetaModel MCP Server — AI-callable calculators and engineering models with certified formulas