What are some alternatives?
When comparing StableBit DrivePool and OpenMediaVault, you can also consider the following products
Drive Bender - Drive Bender, class leading storage pooling technology
FreeNAS - FreeNAS is a storage operating system strong and robust enough to meet the needs of enterprise level businesses.
unRAID Server - A scalable, consumer-oriented, server operating system.
Rockstor - Rockstor is a free and open source NAS (Network Attached Storage) operating system.
mhddfs - The driver combines a several mount points into the single one.
Amahi Home Server - Amahi is a media, home and app server software known for its easy-to-use user interface. Amahi has the best media, backup and web apps for small networks.