Download of USBVision 1.5.1 for Mac was on 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 Mac application is EchoFX.
The application lies within Design & Photo Tools, more precisely Screen Capture. 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:
USBVision devices have been sold by various manufacturers since 1998. Manufacturers include Alpha Data, Belkin, EchoFX, Global Village, Hauppauge, iRez, XLR8 and many others. Devices originally sold as PC-only are also supported. Compatibility can be checked using the USBVision For Mac OS X demo mode. Simply click the "Download" button on the right, and install and run the software.
You may want to check out more Mac applications, such as USBVision or USBVision Tools, which might be similar to USBVision.