OSI-licensed open source
Low-code tools let teams build internal apps, admin panels, automations and databases with visual builders plus code where needed. Open-source options can be self-hosted, audited and extended, which is attractive for internal tools that touch sensitive databases.
This page covers verified OSI-licensed projects across the low-code spectrum: internal-tool builders (Appsmith, ToolJet, Budibase), no-code databases (Baserow), flow-based programming (Node-RED) and developer frameworks (Frappe, Refine). Directus is not listed because its licence is not OSI-approved open source.
Tools, licences and pricing checked against vendor and repository pages on November 7, 2026.
| Tool | Best for | Pricing | Licence |
|---|---|---|---|
| Appsmith | Internal tools on top of databases and APIs | Free, open source (self-hosted); paid cloud and business plans, See vendor pricing | Apache-2.0 |
| ToolJet | Internal tools with a built-in database | Free, open source (Community, self-hosted); paid plans, See vendor pricing | AGPL-3.0 |
| Budibase | Internal apps and automations | Free, open source (self-hosted GPL); paid features, See vendor pricing | GPL-3.0 |
| Baserow | Airtable-style databases you can self-host | Free, open source (self-hosted); cloud plans, See vendor pricing | MIT |
| Node-RED | IoT and event-driven flows | Free, open source | Apache-2.0 |
| Frappe Framework | Developers building data-heavy business apps | Free, open source | MIT |
| Refine | React developers building admin panels | Free, open source | MIT |
Best for: Internal tools on top of databases and APIs · Free, open source (self-hosted); paid cloud and business plans, See vendor pricing
Appsmith is an open-source low-code platform for building admin panels, internal tools and dashboards. It connects to more than 25 databases and any API.
Best for: Internal tools with a built-in database · Free, open source (Community, self-hosted); paid plans, See vendor pricing
ToolJet is an open-source, self-hostable low-code platform for building internal tools, dashboards, workflows and AI agents. Its Community Edition includes a visual app builder, a built-in database and many data source connections.
Best for: Internal apps and automations · Free, open source (self-hosted GPL); paid features, See vendor pricing
Budibase is an open-source platform for building AI agents, automations and internal apps, self-hosted or on Budibase Cloud. Paid features fall under a Business Source License.
Best for: Airtable-style databases you can self-host · Free, open source (self-hosted); cloud plans, See vendor pricing
Baserow is an open-source, no-code platform for building databases, applications, automations and AI agents, available as a cloud service or self-hosted. It is positioned as an Airtable alternative.
Best for: IoT and event-driven flows · Free, open source
Node-RED is a low-code tool for building event-driven applications and a project of the OpenJS Foundation.
Best for: Developers building data-heavy business apps · Free, open source
Frappe is a full-stack web application framework using Python and MariaDB on the server with an integrated client-side library. It was built for ERPNext.
Best for: React developers building admin panels · Free, open source
Refine is an open-source React framework for CRUD-heavy internal tools, admin panels and dashboards. It provides headless hooks for authentication, access control, routing and data, and works with UI libraries like Ant Design and Material UI.
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| If you need… | Start with |
|---|---|
| Visual internal tools over SQL and APIs | Appsmith, ToolJet |
| Internal apps plus automations | Budibase |
| Airtable-style database | Baserow |
| Event-driven or IoT flows | Node-RED |
| Business apps from a Python framework | Frappe Framework |
| React admin panels in code | Refine |
Quick answers to common questions
Platforms that speed up building apps with visual builders and some custom code, released under open-source licences so you can self-host them.
Directus uses a Business Source License, which is not OSI open source, so it is not listed.
Both build internal tools; Appsmith is Apache-2.0 while ToolJet is AGPL-3.0, which can affect how you use or embed them.
Several, including Appsmith-style business plans and Budibase and ToolJet paid tiers; check each vendor's pricing.
List it on TechLogHub and we'll review it for this guide.
