FreshBackMac is described as 'Fresh backgrounds for your Mac from multiple sources' and is an app in the Photos & Graphics category. There are seven alternatives to FreshBackMac for Mac, Windows, Linux and Online / Web-based. The best alternative is Variety Wallpaper Changer, which is both free and Open Source. Other great apps like FreshBackMac are John's Background Switcher (Freemium), Splashify (Paid), Spews (Free) and QuickWall (Free, Open Source).
John’s Background Switcher (or JBS for short) periodically changes the wallpaper on your computer (like every hour or every day) to something interesting. JBS sits in your system tray (down by the clock) and changes your background at the time interval of your choosing.
Spews stands for “Simple Process Excluding Wallpaper Switcher” and is designed to automatically switch your wallpapers on a configurable schedule. Add your image folders, choose your wallpaper options and click the enable button at the bottom.
QuickWall was initialy launched as a wallpaper app that would set wallpapers directly from the commandline. Later due to a lot of requests from users , a theme option was added which uses pywal to generate themes from the wallpapers.
BackStory Wallpapers uses the photos in your Photos library to create beautiful backgrounds for your desktop. Select an arrangement, some albums, and maybe a filter or two. Then set the timer and let BackStory show you collages of images.