By business app, I'm interpreting as something that might be a a basis for writing an enterprise application or an application that might be used by enterprise

By business app, I'm interpreting as something that might be a a basis for writing an enterprise application or an application that might be used by enterprise and not the infrastructure-type of stuff I see posted below like NGINX, Git, etc... Something that's expandable by multiple departments, expandable business-specific logic, modular, plug-in infrastructure, the ability to work with multiple authentication schemes, etc.... Take a look at Liferay Portal: https://github.com/liferay/liferay-portal/ https://github.com/liferay/liferay-portal/ Edit: fixed all my typos.