ProjectorManager 1.6 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. 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. This free Mac application is a product of Sigmasix.
From the developer:
ProjectorManager is a unified standard for operating and controlling data projectors. It allows to control any PJLink-enabled video projector or display connected to your network. This app allows you to turn on and off projectors, shut image, mute audio, switch input sources, and get projector status and infos, such as lamp status, fan errors, temperature errors, etc.