🎮 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

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

A reactive dependency graph engine with topological scheduling and cyclic convergence

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

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.

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

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

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

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

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

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

A Rust/WASM spreadsheet-grade grid and formula engine, driven by declarative workspace definitions.

Türkçe, İK odaklı interaktif Excel eğitimi — 12 modül, 47 ders, 38 alıştırma, 142 quiz. Tek dosya, sıfır bağımlılık, kendi formül motoru (TR+EN).

Excel API implementation (DevChallenge XX 3rd place in Backend nomination)