Open Source Runtime Projects
A runtime is the software layer that provides the services an application needs while it runs. It can manage execution, memory, input and output, scheduling, and communication with operating systems or other services. Runtimes help developers handle these concerns consistently, especially when building asynchronous, concurrent, networked, or sandboxed applications. They may target a programming language, execution environment, or application architecture.
4 repositories · updated September 17, 2026
Lenso: Build Products with Replaceable Plugins and Typed Capabilities
Lenso is a local-first, language-independent runtime designed for building applications with replaceable plugins. It enables defining product roles as typed Capabilities, implemented by Plugins, ensuring explicit relationships and verifiable composition. This system allows for behavior to be added, replaced, and removed without hidden framework magic, making it ideal for long-lived products with evolving boundaries.
TrueForge: The Open-Source Agent Harness for LLM-Powered Agents
TrueForge is an open-source agent harness designed to transform large language models (LLMs) into fully functional agents. It provides the essential runtime layer, handling complex aspects like streaming, session persistence, tool servers, and sandboxing. Developers can leverage TrueForge to build and deploy robust, scalable AI agents with ease.
Tokio: An Asynchronous Runtime for Reliable Rust Applications
Tokio is a powerful asynchronous runtime for the Rust programming language, enabling developers to build fast, reliable, and scalable applications. It provides essential components like I/O, networking, scheduling, and timers, making it ideal for high-performance concurrent systems.
Wassette: A Security-Oriented Runtime for WebAssembly Components
Wassette is a security-focused runtime developed by Microsoft, designed to execute WebAssembly Components via the MCP protocol. It provides a secure sandbox environment, making it easy to extend AI agents with new tools. Leveraging Wasmtime, Wassette offers browser-grade isolation for enhanced security, though it is currently in early development.