Runtime GitHub Repositories (2026) · Open Source Tools

WebAssembly (Wasm) Interpreter - An efficient, lightweight, and deterministic WebAssembly interpreter for embedded systems and plug-in runtimes.

Userspace eBPF runtime for Observability, Network, GPU & General Extensions Framework

Agent memory: long-term memory & agent memory handoff. Claude Code & Codex.

New JavaScript engine written in Rust

An agent runtime for Python. Give your agent real work. Keep control: every action checked before it runs, every run survives a crash without silently redoing anything, every step on the record.

javascript for 🐜's, a tiny runtime with big ambitions

NCalc is a fast and lightweight expression evaluator library for .NET, designed for flexibility and high performance. It supports a wide range of mathematical and logical operations.

Cayu is an open-source Python framework for building and running domain-specific long-horizon agents, with a durable runtime built in.

RingoJS is a JavaScript platform built on the JVM and optimized for server-side applications.

JS runtime lolz

A collection of lower-level libraries for composable network services.

Durable & Deterministic Workflow Engine

A trait to dynamically add methods to a class

NativeScript for Android using v8

🦩 Joi like validations for TypeScript

Nested copies made easy in Kotlin

DevTools and runtime environment for the Elm programming language

The Charm++ parallel programming system. Visit https://charmplusplus.org/ for more information.

LingFrame: A JVM Runtime Security Governance Solution for Long-Running Systems. It implements modular isolation and zero-trust permission control to deliver automatic method-level full-link tracing, security auditing, and zero-downtime canary releases.

PHPStreamServer is an event-loop-based application server and process supervisor built entirely in PHP.