n8n is a free Node-based source-available Workflow Automation Tool. It can be self-hosted, easily extended, and so also used with internal tools.
n8n.io vs ThingsBoard.io opinions
n8n is excellent at what it does, but I wouldn't call it an alternative to ThingsBoard. It's more similar to a self-hosted IFTTT/Zapier, whereas ThingsBoard is for collecting data from IoT devices, it would be an alternative to GCP IoT or Azure IoT Hub
Node-RED provides a browser-based flow editor that makes it easy to wire together flows using the wide range nodes in the palette. Flows can be then deployed to the runtime in a single-click.This app doesn't have any features at the moment.
ioBroker is an integration platform for the Internet of Things, focused on Smart home, Building Automation, Smart Metering, Ambient Assisted Living, Process Automation, Visualization and Data Logging. It aims to be a possible replacement or extension for software like f.e.
Zenaton is a developer tool and hosted workflow engine for writing, running and monitoring all of your background processes whether it is a single task or a long running workflow. It allows developers to easily integrate third party services and APIs iby triggering tasks and...
t6 is an Api ("oriented-Data") + mobile application (PWA) to connect physical Objects with time-series DB. JWT token secured over SSL (https) + signed payload, t6 api and can be used On Premise/SaaS.
Atman IoT Platform is an online service focused on rapid IoT solution prototyping. It is focused on getting IoT solutions out with as little effort as possible. It offers a responsive OEM web app that can be customized to the project's needs.
The Open Platform for the Internet of Things Industrial strength open-source application enablement platform for IoT. It provides a multi-tenant microservice-based infrastructure that includes the key features to build and deploy IoT applications.