The best alternatives to Folder Peek are Trickster for Mac, Quick Access, and Alias. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of Folder Peek?
Blaze— Create beautiful 1-click content in your brand style with AI
Trickster keeps track of recent files you’ve been using on your Mac and gives you super easy and lightning fast access to them. Productivity awesomeness from @apparentsoft.
Quick Access is an native macOS app written in pure Swift that allow us to quickly access to favorite files, folders and apps. No more cumbersome navigations and frustration remembering your app name