Iron Calc

open-sheet is a spreadsheet framework for coding agents that represents workbook models as React and TypeScript source. Instead of writing fragile A1-style cell addresses, models can use named references such as `ref('pl').column('revenue')`, which open-sheet resolves at compile time while handling cell addressing, formula references, recalculation, and formula-tree previews. It exports live formulas to XLSX, as well as CSV, HTML, and PDF formats, and reports cells it cannot compute as `#NOT_EVALUATED` rather than emitting a plausible number. The project provides an `npx @open-sheet/cli` initializer, is distributed under the MIT license, and is hosted at open-sheet.dev.

iCode is a lightweight, extensible, fully offline terminal development platform and toolkit for orchestrating AI agents and workflows, developed as an open-source project by openJiuwen-ai. Its terminal interface shows the active agent, model, approval mode and session; renders Markdown and diagrams; and provides workflow execution views with per-node models, tool calls and token spending. Agents are configured rather than coded and can include instructions, tools, sub-agents, skills, MCP servers and memory. Model profiles from different providers can be switched during a conversation, while file diffs, turn-based rollback, token and cache usage, model/tool timelines, and an embedded shell expose and control execution. iCode does not include models, telemetry, analytics or crash reporting; it uses only the providers, MCP servers and hooks configured by the user. The repository describes the project as a work in progress, requires uv to run, and distributes it under the Apache License 2.0 alongside separately licensed third-party components.

Libre Calculator is a free, open-source collection of web and desktop calculators for finance, construction, cooking, physics, education, health, geometry, statistics, unit conversion, and other domains. The web version uses Astro and React, while the desktop app uses Tauri; calculators are organized into optional packs, and each calculator has its own web page with offline caching for active packs. Each result is generated from the user's inputs and includes the calculation steps, a diagram, and a short lesson explaining the formula. Its calculation engines are pure functions with written numeric contracts and fixture tests; arithmetic uses 50-digit decimals and rounds only for display, while invalid input produces an explicit failure instead of a guessed result. The desktop app provides a quick panel opened with Cmd/Ctrl+Shift+C. The project is distributed as open-source software through its website and GitHub repository, with desktop builds for macOS, Windows, and Linux.

Gridline is an independent, Excel-inspired browser spreadsheet application built with plain HTML, CSS, and JavaScript. It uses a WebGPU worksheet renderer with a Canvas2D fallback, a formula interpreter with dependency tracking and cached results, transactional editing, and local workbook storage without a framework, CDN, account, application server, or runtime package dependencies. The application supports worksheets, formatting, charts, sorting, filtering, notes, conditional rules, undo/redo, cross-sheet and relative or absolute A1 references, CSV/TSV import and export, native .gridline JSON files, and a documented subset of XLSX. Its engine can also be used directly as an ES module. Local autosaves remain in the current browser profile and origin rather than cloud storage; WebGPU requires a compatible browser and suitable origin, while calculation and serialization run synchronously on the main thread. Gridline is an engineering preview released under the MIT license. XLSX support is not a lossless Excel round trip: pivots, VBA, Power Query, external links, dynamic arrays, advanced formatting, rich text, charts, notes, and conditional rules are not fully supported or exported. The repository reports passing Node and browser test suites, but its release tests did not verify WebGPU pipeline execution or hardware performance.

OpenCode is an open-source AI coding agent developed by anomalyco. It is used as a terminal-based coding agent and external coding harness, with a beta desktop application also available. The CLI includes a full-access build agent for development work and a read-only plan agent for code analysis and exploration; the plan agent denies file edits by default and asks permission before running shell commands. OpenCode also provides a general subagent for complex searches and multistep tasks, and can be installed through its shell installer, package managers, or platform-specific desktop packages.