Download of TS870RC 4.1 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This software for Mac OS X is an intellectual property of whxde. The application lies within Internet & Network Tools, more precisely Network tools.
From the developer:
A remote radio control app for Kenwood TS-870 Transceiver.
Main features:
- Set amateur radio bands with preselected buttons.
- Set frequency with up/down button shortcuts.
- Additional shortcuts (listed in panel about TS870RC).
- Select SSB Receiver AGC control.
You may want to check out more software for Mac, such as IPNetShareX, PPPoE Connector or tn3270, which might be similar to TS870RC.