Add open source low code platform

README.md

@@ -84,6 +84,12 @@ A curated list of awesome SaaS (Software as a server) starter.
 - [Huozige](https://www.grapecity.com.cn/solutions/huozige) - Low code platform.
 - [艾拉云](https://www.illacloud.com/zh-CN) - 分钟级开发 轻松搭建内部工具
 
+#### Open Source
+
+- [sunmao](https://github.com/smartxworks/sunmao-ui) - Front-end low-code framework. Through Sunmao, you can easily encapsulate any front-end UI components into low-code component libraries to build your own low-code UI development platform, making front-end development as tight as Sunmao
+- [illa-builder](https://github.com/illacloud/illa-builder) - Retool open-source alternative, with low-code UI components and support for multiple data resources.
+- [nocobase](https://www.nocobase.com/) - No programming required, build your own collaboration platform, management system with NocoBase in minutes.
+
 ## Docs
 
 - [Craft](https://www.craft.do/) - Built for digital devices from the ground-up, Craft brings back the joy to writing.