iii-hq/iii - OSS Alternative - Discover Top Open Source Alternatives to Popular Software
Backend Orchestration Platform
15.4k 2026-04-27

iii-hq/iii

iii unifies diverse backend services like APIs, task queues, and schedulers into a single engine using Function, Trigger, and Worker primitives for simplified distributed system development.

Core Features

Durable orchestration across workers and triggers
Interoperable execution across languages as if it were one runtime
Live discovery of functions and triggers across the system
Live extensibility to add new capabilities without redesigning architecture
Live observability for operations, traces, and system behavior

Detailed Introduction

iii addresses the complexity of modern backend development by replacing a fragmented stack of API frameworks, task queues, cron schedulers, pub/sub, state stores, and observability pipelines with a single, unified engine. It introduces three core primitives – Function, Trigger, and Worker – to provide a cohesive model for backend execution. This approach simplifies distributed system design, offering durable orchestration, language-agnostic execution, and real-time discovery, extensibility, and observability across the entire backend stack, much like React unified frontend UI development.

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