Enmotus was founded in 2010 to focus on driver level SSD tiering for SSD/HDD and SSD/SSD solutions and used an intelligent software driver to allow users to combine a fast SSD with a slower device to create a cost effective, large boot drive bigger than possible with a single SSD and without the need to use RAID. The technology was also used by AMD as part of their first generation StoreMI solution (no longer supported by AMD).
Sadly, Enmotus was unable to survive the adverse business conditions created by the pandemic and resulting supply chain issues and was forced to permanently close it's doors at the end of 2021. The company looked for potential purchasers for the complete business for 12-18 months but none were interested in continuing Enmotus as a business.
For FuzeDrive software only users (i.e. NOT the FuzeDrive SSD NVMe drive) this means that the web license server will no longer work and tiering will no longer work and is disabled. Data is still accessible but may not be performing as well from a disk IO perspective. It is recommended that the data be backed up to new SSD or HDD with capacity at least the same size as the FuzeDrive and the software removed. Once all data has been backed up, use either the Enmotus command line ecmd --delete command (see ecmd --help) or use diskpart clean on the raw disk(s) so they can be seen by Windows again as normal disks (reboot may be required). If you are using FuzeDrive as a boot drive, make sure to use a boot drive backup imaging software like Macrium Reflect that can clone a live running Windows boot image. Then boot from the newly imaged drive before attempting to delete or diskpart clean the old FuzeDrive disks.
For FuzeDrive SSD NVMe users, the driver software is still active on the Microsoft update servers and the drive will continue to be auto detected and the software will download when the device is detected by Windows. At the time of writing, the drives still function on Windows 10 and will work with Windows 11 PCs (via Win 10 to Win 11 upgrade) and unlike FuzeDrive software only products, do not require a license key to operate. FuzionX users how ever may see license issues if using the FuzeDrive SSD as part of a tier with another disk drive. If you have any concerns about the longevity or lack of support, then it is recommend that like above you migrate any data or OS on the drive to a new SSD of equivalent size.
Update: The Enmotus IP was licensed by an SSD vendor in late 2022 for the purposes of producing new versions specifically for use with their products. It is not known at this time if a newer version of the FuzeDrive software will ever be developed. This site hopefully will be updated with information if it ever comes available.