SampleTank 3.5 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The application is included in Audio & Video Tools. This Mac application is a product of IK Multimedia. 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.
From the developer:
SampleTank is the ultimate sample-workstation. With an exclusive combination of features and sounds, SampleTank stands apart from any other sample-based virtual instrument, as one of the most powerful and easy-to-use solutions for making fully produced songs out of the box.
You may want to check out more Mac applications, such as SampleTank 3, which might be similar to SampleTank.