Top 10 Open Source Alternatives to OutSystems in 2025

As enterprises seek more agile, customizable, and cost-effective solutions, open-source low-code platforms are emerging as powerful alternatives to traditional options like OutSystems. Here’s a look at the top open-source alternatives available in 2025.

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1. Appsmith

Description: Appsmith is an open-source low-code platform ideal for rapidly building internal tools and applications. It features an intuitive drag-and-drop interface and extensive pre-built widgets.
Key Features:
Drag-and-drop UI builder.
Connects to databases, APIs, and GraphQL endpoints.
Inline JavaScript customization.
Git-based version control.
Pre-built widgets.
Why Choose It? Rapid development focus, strong community support, and highly customizable. Learn more about Appsmith

2. Budibase

Description: Budibase focuses on building internal tools, forms, and admin panels, and supports on-premise deployments with Docker and Kubernetes.
Key Features:
Connects to databases, spreadsheets, and APIs.
On-premise hosting with Docker and K8s.
Form builder.
Automated workflows.
Role-based access control.
Why Choose It? Strong data management capabilities, easy-to-use interface, and self-hosted options. Discover Budibase

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3. ToolJet

Description: ToolJet is a full-stack, open-source low-code platform designed for building custom internal tools, supporting both JavaScript and Python for flexibility.
Key Features:
Drag-and-drop UI builder.
JavaScript and Python support.
Connects to various databases and APIs.
Self-hosted deployment option.
Open-source.
Why Choose It? Extensive customization, easy deployment, and strong community support. Explore ToolJet

4. UI Bakery

Description: UI Bakery is a self-hosted, drag-and-drop low-code platform for quickly building custom applications with customizable actions.
Key Features:
Self-hosted.
Drag-and-drop interface.
Customizable actions.
Connects to various data sources.
Rapid application development.
Why Choose It? Easy to use, self-hosted, and rapid app development capabilities. Discover UI Bakery

5. NocoDB

Description: NocoDB transforms databases into a smart spreadsheet interface, allowing for easy data manipulation and different view formats.
Key Features:
Transforms databases into spreadsheet interfaces.
Supports multiple database types.
Various view types (grid, gallery, form, etc.).
Basic operation capabilities.
Easy data manipulation.
Why Choose It? User-friendly, intuitive for data manipulation, and requires no coding. Learn more about NocoDB

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6. Joget

Description: Joget merges no-code/low-code development with workflow management, focusing on quick, secure application development and deployment.
Key Features:
Workflow management tools.
Combines no-code and low-code approaches.
Rapid application development capabilities.
Secure deployment options.
Open source.
Why Choose It? Suitable for workflow automation and secure application deployment. Explore Joget

7. Node-RED

Description: Node-RED is a flow-based development tool for visual programming primarily used for connecting hardware devices, APIs, and online services.
Key Features:
Flow-based programming.
Browser-based editor.
Connects hardware devices, APIs, and online services.
Strong focus on IoT projects.
Open Source.
Why Choose It? Ideal for IoT applications and easy integration of devices and APIs. Discover Node-RED

8. Saltcorn

Description: Saltcorn is an open-source, low-code platform for creating web and mobile applications using a drag-and-drop builder.
Key Features:
Drag-and-drop builder.
Web and mobile application development.
Free and open source.
Quick to create solutions.
Customizable.
Why Choose It? Suitable for web and mobile app development with a user-friendly interface. Learn more about Saltcorn

9. Convertigo

Description: Convertigo is an enterprise-grade low-code/no-code platform for building complex, multi-device applications while reducing investment costs.
Key Features:
Enterprise grade capabilities.
Low-code and no-code development.
Multi-device application support.
Reduced development costs.
Open Source.
Why Choose It? Ideal for enterprise digital transformation and multi-device app development. Explore Convertigo

10. Dify

Description: Dify is an open-source platform for building AI applications, combining Backend-as-a-Service with LLMOps and supporting mainstream language models.
Key Features:
Open-source platform for AI.
Intuitive prompt orchestration.
Combines backend as a service with LLMOps.
Flexible AI agent framework.
Supports mainstream language models.
Why Choose It? Simplifies LLM app development and is user-friendly for both developers and non-technical users. Discover Dify

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FAQ

1. What is Appsmith?

Appsmith is an open-source, low-code platform focused on building internal tools and applications rapidly with features like drag-and-drop UI builder, database/API connections, and JavaScript customization. Learn more about Appsmith

2. What can I do with Budibase?

Budibase helps you build internal tools, forms, and admin panels, connecting to various databases and APIs, and supports self-hosting with Docker and Kubernetes. Discover Budibase

3. How does ToolJet support developers?

ToolJet enables building custom internal tools with a full-stack platform supporting JavaScript and Python, offering self-hosted deployment for complete data control. Explore ToolJet

4. What is unique about UI Bakery?

UI Bakery is a self-hosted, drag-and-drop low-code platform for quick and easy custom application development, allowing customizable actions and data connections. Learn more about UI Bakery

5. How does NocoDB transform databases?

NocoDB converts databases into a smart spreadsheet interface, enabling easy data manipulation and viewing in different formats without needing code. Discover NocoDB

6. What are the features of Joget?

Joget combines no-code/low-code development with workflow management to enable rapid and secure application development and deployment. Learn more about Joget

7. What is Node-RED used for?

Node-RED is a flow-based programming tool for connecting hardware devices, APIs, and online services, mainly used in IoT projects. Explore Node-RED

8. What applications can you build with Saltcorn?

Saltcorn allows the creation of web and mobile applications with a drag-and-drop builder and is free and open-source. Discover Saltcorn

9. What is Convertigo suitable for?

Convertigo is an enterprise-grade platform for building complex multi-device applications, focusing on reducing investment costs and accelerating digital transformation. Learn more about Convertigo

10. How does Dify support AI application development?

Dify is an open-source platform for building AI applications, combining backend-as-a-service with LLMOps and supporting mainstream language models. Explore Dify

About the Author

Violetta Bonenkamp, also known as MeanCEO, is an experienced startup founder with an impressive educational background including an MBA and four other higher education degrees. She has over 20 years of work experience across multiple countries, including 5 years as a solopreneur and serial entrepreneur. She’s been living, studying and working in many countries around the globe and her extensive multicultural experience has influenced her immensely.

Violetta is a true multiple specialist who has built expertise in Linguistics, Education, Business Management, Blockchain, Entrepreneurship, Intellectual Property, Game Design, AI, SEO, Digital Marketing, cyber security and zero code automations. Her extensive educational journey includes a Master of Arts in Linguistics and Education, an Advanced Master in Linguistics from Belgium (2006-2007), an MBA from Blekinge Institute of Technology in Sweden (2006-2008), and an Erasmus Mundus joint program European Master of Higher Education from universities in Norway, Finland, and Portugal (2009).

She is the founder of Fe/male Switch, a startup game that encourages women to enter STEM fields, and also leads CADChain, and multiple other projects like the Directory of 1,000 Startup Cities with a proprietary MeanCEO Index that ranks cities for female entrepreneurs. Violetta created the "gamepreneurship" methodology, which forms the scientific basis of her startup game. She also builds a lot of SEO tools for startups. Her achievements include being named one of the top 100 women in Europe by EU Startups in 2022 and being nominated for Impact Person of the year at the Dutch Blockchain Week. She is an author with Sifted and a speaker at different Universities. Recently she published a book on Startup Idea Validation the right way: from zero to first customers and beyond and launched a Directory of 1,500+ websites for startups to list themselves in order to gain traction and build backlinks.

For the past several years Violetta has been living between the Netherlands and Malta, while also regularly traveling to different destinations around the globe, usually due to her entrepreneurial activities. This has led her to start writing about different locations and amenities from the POV of an entrepreneur. Here’s her recent article about the best hotels in Italy to work from.

About the Publication

Fe/male Switch is an innovative startup platform designed to empower women entrepreneurs through an immersive, game-like experience. Founded in 2020 during the pandemic "without any funding and without any code," this non-profit initiative has evolved into a comprehensive educational tool for aspiring female entrepreneurs.The platform was co-founded by Violetta Shishkina-Bonenkamp, who serves as CEO and one of the lead authors of the Startup News branch.

Mission and Purpose

Fe/male Switch Foundation was created to address the gender gap in the tech and entrepreneurship space. The platform aims to skill-up future female tech leaders and empower them to create resilient and innovative tech startups through what they call "gamepreneurship". By putting players in a virtual startup village where they must survive and thrive, the startup game allows women to test their entrepreneurial abilities without financial risk.

Key Features

The platform offers a unique blend of news, resources,learning, networking, and practical application within a supportive, female-focused environment:

Skill Lab: Micro-modules covering essential startup skills
Virtual Startup Building: Create or join startups and tackle real-world challenges
AI Co-founder (PlayPal): Guides users through the startup process
SANDBOX: A testing environment for idea validation before launch
Wellness Integration: Virtual activities to balance work and self-care
Marketplace: Buy or sell expert sessions and tutorials

Impact and Growth

Since its inception, Fe/male Switch has shown impressive growth:

3,000+ female entrepreneurs in the community
100+ startup tools built
5,000+ pieces of articles and news written

Partnerships

Fe/male Switch has formed strategic partnerships to enhance its offerings. In January 2022, it teamed up with global website builder Tilda to provide free access to website building tools and mentorship services for Fe/male Switch participants.

Recognition

Fe/male Switch has received media attention for its innovative approach to closing the gender gap in tech entrepreneurship. The platform has been featured in various publications highlighting its unique "play to learn and earn" model.