What are some alternatives?
When comparing Drive Bender and PoolHD, you can also consider the following products
StableBit DrivePool - State of the art, file based drive pooling software.
OpenMediaVault - OpenMediaVault is the next generation network attached storage (NAS) solution based on Debian Linux.
mhddfs - The driver combines a several mount points into the single one.
mergerfs - mergerfs is a union filesystem geared towards simplifing storage and management of files across...
unRAID Server - A scalable, consumer-oriented, server operating system.
FlexRaid T-Raid - Unify & organize your data. Protect & recover from disk failures!