There are 2 repositories under apaas topic.
明道云私有部署版 - 快速部署可免费使用的零代码企业应用平台(APaaS)
App Builders、Enterprise Platforms、LowCode、Low-Code
【零代码平台】免费的APaaS零代码平台&低代码平台,快速搭建企业级应用也可以作为数据采集工具,无需编程简单易学!高度灵活设计,既能解决纸质化办公需求,又能满足复杂业务系统
An open source apaas platform written in Java, cooperating with Quarkus and Cloud Native stack. bosuyun.com is an organization focusing on lowcode and nocode apps development.
MongoDB + Hibernate OGM quick start using Oracle Application Container Cloud
aPaaS - application Platform as a Service which allows anyone to create specific SDLC and test it in a sandbox environment.