The best open-source Integration Orchestration tools, curated: 22 in the registry, including Bento, Higress, Hookdeck Outpost. Every tool is open-source; each entry lists license, self-hostability, and links.
Bento· tool, 2026-10-13 Bento is WarpStream Labs' MIT-licensed, OSI-open continuation of Benthos — forked from the project before it was relicensed to the source-available Redpanda Connect — giving config-driven, declarative stream-processing pipelines with at-least-once delivery across Kafka, AWS, Azure, GCP, and more. Written in Go.
Higress· tool, 2026-10-13 Higress is an Apache-2.0, Alibaba-built cloud-native API gateway on Envoy and Istio that doubles as an AI gateway — unifying LLM-provider routing, token rate-limiting, and model fallback with standard microservice routing and Kubernetes ingress, extensible via Wasm plugins.
Hookdeck Outpost· tool, 2026-10-13 Hookdeck Outpost is Apache-2.0 infrastructure for sending outbound webhooks and delivering events from your platform to your customers' systems. One self-hosted service fans a single event stream out to the widest set of destinations: webhooks plus AWS SQS, Kinesis, S3, EventBridge, GCP Pub/Sub, Azure Service Bus, RabbitMQ, Kafka, and Cloudflare Queues. Run it anywhere for free, or use the managed Hookdeck Outpost (same codebase, usage-based from $10 per million events).
October Bus· tool, 2026-09-26 A local-first coordination layer for AI agents and harnesses (Apache-2.0): agents discover peers, exchange durable messages, delegate work, coordinate shared tasks, and request human input — with delivery guarantees, identity management, and no cloud control plane. Go daemon + SQLite, TypeScript SDK, MCP bindings.
Repairo· tool, 2026-09-24 Repairo is an Apache-2.0 CLI that detects breaking OpenAPI/API drift and auto-generates AST-transformed, compile-checked fix PRs in TypeScript, Python or Go. It ships an npm package (repairo-cli), CI and a hosted beta, with 184 commits behind it. It carries only 2 stars, so treat it as early and unproven — but it is a real project, not a toy.
AWS TOLAP· tool, 2026-09-23 Apache-2.0 protocol from AWS Labs — the Tool-Object Level Access Protocol — that enforces object-level access control (column, row, field) around the tool/function layer so data-access policies travel with the data rather than the agent. It is protocol-agnostic across MCP, LangChain, Bedrock Agents and Semantic Kernel, and ships enforcement SDKs for .NET, Python and TypeScript plus a reference policy server. A legitimate first-party AWS launch, still almost undiscovered (5 stars).
HookDeploy launches edge webhook infrastructure with a source-available private-delivery agent· news, 2026-09-23 HookDeploy is a paid hosted SaaS running on Cloudflare's edge that captures, inspects, transforms and routes webhooks, paired with a source-available mTLS dial-out agent that delivers events to internal infrastructure without opening inbound ports. It is not open-source — only the dial-out agent is source-available, and the product itself is a paid hosted service. Pricing runs Free (10k requests/mo) through Starter $9, Pro $39, Scale $99 and custom Enterprise, across 7 relay regions.
HarnessRouter· tool, 2026-09-21 Apache-2.0 abstraction layer, pitched as an OpenRouter for agent harnesses: one API your product calls to run a task, retrieve the result, and switch between coding-agent harnesses (Codex, Claude Code, Hermes and others) without re-implementing each integration. It handles persistent sessions, file handling and streaming behind that single interface. Self-hostable via Docker with your own keys and infrastructure; a managed cloud version exists separately.
Monid· tool, 2026-09-17 MIT connector framework (TypeScript on Deno) from monid-ai, pitched as 'OpenRouter for agent tools': one interface an agent uses to reach many external tools (search, scraping, people and company enrichment, market data, media generation) instead of hardcoding each vendor. The repo is the open, self-hostable connector layer and execution engine, run locally with keys you bring. A separate hosted platform (monid.ai) sells 2,000+ connectors across 72+ providers on metered billing.
MCP Inspector· tool, 2026-09-03 ~10621 stars; via ossinsight.io
mcp-use· tool, 2026-09-03 ~10462 stars; via ossinsight.io
OpenMetadata· tool, 2026-09-03 OSS alt to Collibra; ~14782 stars; via ossinsight.io
StackStorm· tool, 2026-09-03 Rules+workflow engine; heavy infra
Timeplus Proton· tool, 2026-09-03 OSS alt to Materialize; ~2238 stars; via openalternative.co
Trigger.dev· tool, 2026-09-03 OSS alt to Zapier (dev-facing), Inngest; ~15900 stars; complements Huginn (XREF), Benthos/Bento, Windmill (XREF); Apache-2.0, self-hostable. Long-running/durable jobs triggered by events/schedules/webhooks; you supply the app credentials in code. No per-platform ToS flag.; via openalternative.co, GitHub cross-ref