Mastra is a framework for building AI-powered applications and agents with a modern TypeScript stack.

AI workflow engine for code review, assistants, and automation — orchestrate checks, MCP tools, and AI providers with YAML-driven pipelines

Rules Engine expressed in simple json

This module provides a rule engine that can be executed on your Otter application to customize your application (translations, placeholders and configs) based on a json file generated by your CMS.

Framework-agnostic context-compression engine (model-driven, 3-tier LSM). Pure core: no host dependency.

DEPRECATED - This package has moved to https://github.com/stripe/sync-engine

Advanced cross-platform operating system monitoring utilities with TypeScript support

Template engine based on Lo-Dash template, but adds features like the ability to register helpers and more easily set data to be used as context in templates.

A CSS selector engine.

Module for managing integration scenario.

This package contains the trace engine implementation used by the DevTools Performance Panel.

Reusable library to quickly create and customise web maps showing Eurostat data directly retrieved from Eurostat database.

Core engine for Kubb. Provides the plugin driver, file manager and build orchestration used by every Kubb plugin.

Best-of-breed templating in browser or on Node.js (with Express 4, Hapi and Browserify integration)

3D Engine Components for luma.gl

SpreadJS sheets calc engine module

Metadata-driven charts library for Praxis UI Angular with engine adapters and Apache ECharts as the initial renderer.

Open-source Business Rules Engine for Node.js, powered by Rust

express.js inspired template-engine manager.

UR-Nexus — autonomous engineering workflow engine (plan, execute, test, verify, document, benchmark, reproduce)