Working with the LoadMaster was a great experience. Installation was quick and simple, and their web-based management console is intuitive and easy to use. The LoadMaster includes essential features that are required for load balancing DirectAccess servers, and advanced capabilities that can be leveraged to enhance geographic redundancy for multisite deployments.
KEMP offers the widest platform coverage with their solutions, including dedicated hardware appliances, virtual appliances for multiple hypervisors including Hyper-V, cloud-based including Microsoft Azure, as well as bare metal support for installation on your own hardware. You can download a fully functional free trial here.
You can view and download the Windows Server 2012 R2 DirectAccess Deployment Guide for the KEMP LoadMaster load balancing solution here.
Additional Resources
Video: Enable Load Balancing for DirectAccess
Configure KEMP LoadMaster Load Balancer for DirectAccess Network Location Server (NLS)
DirectAccess Single NIC Load Balancing with KEMP LoadMaster Load Balancers
DirectAccess and the Free KEMP LoadMaster Load Balancer
Webinar Recording: DirectAccess Load Balancing Tips and Tricks
Webinar Recording: DirectAccess Multisite with Windows 10 and KEMP LoadMaster GEO
Implementing DirectAccess with Windows Server 2016 book