The 1.0 version of ImpulseOSD for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The program lies within System Tools, more precisely Backup & Restore. 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. The actual developer of this free software for Mac is Codelayer.
From the developer:
ImpulseOSD is a backup and firmware update tool for ImpulseOSD hardware devices. The app offers a lot more than a barebones OSD added on to the side of your flight controller as an afterthought. You get more stable loop times and consistently solid performance by letting your FC focus on what it does best: real-time flight control.
You may want to check out more Mac applications, such as Time Master Central, Synk Professional or Online Backup, which might be related to ImpulseOSD.