The 4.2 version of JetDrive Toolbox for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. The software lies within System Tools, more precisely System Optimization. The actual developer of this free Mac application is Transcend Information, Inc.
From the developer:
JetDrive Toolbox is a useful and free-to-download software that offers a new level of storage experience. This application helps maintain a healthy SSD by keeping it up-to-date, preventing functional degradation, and predicting problems before they happen.
You may want to check out more software for Mac, such as Toolbox for iWork, Toolbox for Pages - Templates Bundle or Electroacoustics Toolbox, which might be similar to JetDrive Toolbox.
System Optimization
Device Assistants