Stellar Drive Defrag 2.5.0.1 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. This software was originally developed by Stellar Information Technology Pvt. Ltd. We recommend checking the downloaded files with any free antivirus. The most popular version among the software users is 2.5. The software lies within System Utilities, more precisely System Optimization.
From the developer:
Stellar Drive Defrag, defrags Mac hard drive, organizes free space, and thus optimizes Mac’s performance. This tool even works on boot volume by creating Mac bootable DVD. Some of the very efficient features of this tool are defragmentation of Mac files i.e. the tool collects all logically related pieces of scattered file and locates them at nearby locations and hence reduces fragments of that file.
You may want to check out more software, such as Stellar Data Recovery Premium, Stellar Data Recovery Professional or Stellar Data Recovery Technician, which might be related to Stellar Drive Defrag.
System Optimization
System Optimization