Activepieces

Activepieces is an open-source alternative to Zapier and n8n, built as a monorepo with a NestJS backend, a Vue-based flow builder frontend, and a Postgres/Redis persistence layer for execution state and queuing. Automations are modeled as directed flows of 'Pieces' — self-contained TypeScript modules exposing triggers and actions with typed input schemas — which are versioned, hot-reloadable, and published independently via an npm-like registry, allowing teams to build and share custom connectors without forking the core engine. Execution is handled by isolated sandboxed workers (using Node.js vm2/isolate-vm) that run flow steps with per-step retries, conditional branching, loops, and code steps for arbitrary JS/TS or Python snippets. The platform targets platform engineers, internal-tools teams, and DevOps groups who need to automate SaaS integrations, ETL glue logic, and internal approval workflows while retaining control over data residency through self-hosting (Docker Compose, Helm chart for Kubernetes). It ships with 200+ pre-built pieces (Slack, Google Workspace, GitHub, Postgres, HTTP, OpenAI, etc.), a webhook/HTTP trigger framework, and an embedded 'Activepieces Copilot' that uses LLMs to scaffold flows or generate custom piece code from natural language prompts. Its MIT-licensed core plus a source-available Enterprise Edition (SSO, RBAC, audit logs) make it attractive for regulated environments that need an auditable, extensible automation runtime rather than a black-box SaaS.