There are many server applications available for macOS that can be used to set up a server for a variety of purposes. Some popular options include:

Apache HTTP Server
Apache HTTP Server is a widely-used, open-source web server that can be used to host websites and web applications on macOS.

NGINX
NGINX is a high-performance web server and reverse proxy that is widely used for hosting websites and web applications.

MySQL
MySQL is a popular open-source database management system that can be used to store and manage data for a variety of applications.

MongoDB
MongoDB is a popular NoSQL database system that is well-suited for storing large amounts of structured and unstructured data.

Redis
Redis is an in-memory data store that can be used as a cache, message broker, or database.

PostgreSQL
PostgreSQL is a powerful, open-source object-relational database management system that can be used for a wide range of applications.

The best server application for your needs will depend on the specific requirements of your project. Consider factors such as the type of data you need to store, the scale of your project, and any performance or security requirements you have when choosing a server application.