The best open-source Integration Orchestration tools, curated: 22 in the registry, including October Bus, Repairo, AWS TOLAP. Every tool is open-source; each entry lists license, self-hostability, and links.
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.
Apache SeaTunnel· tool, 2026-09-03 OSS alt to Fivetran/Airbyte; ~9543 stars; via ossinsight.io
Bento· tool, 2026-09-03 OSS alt to closed stream processors; the fully-open Benthos; ~2100 stars; complements Benthos/redpanda-data-connect (upstream), Trigger.dev, SeaTunnel (XREF); MIT. Community fork of Benthos, created after the original (now redpanda-data/connect) moved to a restrictive source-available license -> Bento is the OSI-open continuation. Config-driven stream pipelines using official service creds. No per-platform ToS flag.
DataHub· tool, 2026-09-03 ~12487 stars; via ossinsight.io
Google Workspace CLI· tool, 2026-09-03 Official one-command CLI for Drive/Gmail/Calendar/Docs; Rust; ~30k stars; scriptable Workspace automation
Higress· tool, 2026-09-03 ~9048 stars; via ossinsight.io
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