The built-in pfSense load balancer may be perfectly adequate for many use cases, especially if you are setting up a load balancer for a home or small office/home office network. If you require a more enterprise-level solution for load balancing, however, you need not fret: High Availability Proxy (HAProxy), an open source program (covered by the GPL) which is advertised as a fast and reliable solution offering high availability, [and] load balancing is available as a third-party package.
It is not within the scope of this chapter to provide a detailed discussion of HAProxy- it will be covered in more depth in Chapter 12, Extending pfSense with Packages. Be aware that it is an option, however, and that installation ...