PoolHD is described as 'Disk pooling application that focuses on integration, speed and ease of use. Take two or more hard drives and create a storage drive that can be expanded seamlessly by simply adding more drives' and is a Disk Manager. There are eight alternatives to PoolHD for Linux and Windows. The best PoolHD alternative is Unraid. It's not free, so if you're looking for a free alternative, you could try Liquesce or EON ZFS Storage. Other great apps like PoolHD are StableBit DrivePool, mergerfs, Greyhole and Drive Bender.