yelloGUI 3.1 for Mac was available to download from 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 free software for Mac is LYNX Technik AG. We recommend checking the downloaded files with any free antivirus. YelloGUI for Mac lies within System Tools, more precisely Device Assistants.
From the developer:
yelloGUI is a complementary software application for yellobriks that permits some yellobriks to be configured over USB using a Mac computer. With the yelloGUI, you have access to a host of advanced settings and adjustments of the individual yellobrik modules. Typically, yellobriks are configured via the integrated module rotary switches, dip switches and indicators.
You may want to check out more Mac applications, such as PodManager, iPhoneDisk or SpaceReporter, which might be related to yelloGUI.