StellarDriveDefrag 3.0 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The actual developer of this software for Mac is Stellar Information Technology Pvt. Ltd. The application is included in System Tools. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software.
From the developer:
StellarDriveDefrag is here to help you systematize the fragmented data and free space in the Mac volumes. The software gathers the fragmented data of a file and stores together into a single chunk of memory, which makes the data access speed faster. Features Defrags the meta-data files in a volume. Optimizes the fragmented free spaces in a volume by clubbing them together.
You may want to check out more software for Mac, such as Dock Delight or Snow Checker, which might be related to StellarDriveDefrag.