HighTop 1.3.4 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. This free software for Mac OS X is an intellectual property of Ryan Hanson. 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 software lies within System Tools, more precisely File Managers.
From the developer:
HighTop offers a convenient way to work with favorite local folders, Google Drive, or Dropbox. Thus you avoid hunting for Finder windows, digging up a buried Desktop, or loading a browser tab. HighTop is a tree view of your files, and it is packed with macOS integration. You can quickly search as you type across all Cloud accounts and favorite local folders at once. Your Cloud accounts are accessed securely and directly using official libraries.
You may want to check out more software for Mac, such as ImTOO DVD to MP4 Converter, inVIZible or CombineTextFiles, which might be similar to HighTop.