Unarchiver One 3.6 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. This free software for Mac OS X is an intellectual property of Trend Micro. We recommend checking the downloaded files with any free antivirus.
From the developer:
Best FREE Mac compression, encryption and archiving tool in 2021. Unrar and Unzip files in seconds | Unarchiver One can open and extract archive files including RAR, Zip, 7z, gzip, bzip2, ISO and more fast and easily.All common archive formats are supported:
RAR, 7z, ZIP, XZ, BZIP2, GZIP, RAR, WIM, ARJ, CAB, CHM, CPIO, CramFS, DEB, DMG, FAT, HFS, ISO, LZH, LZMA, MBR, MSI, NSIS, NTFS, RPM, SquashFS, UDF, VHD, WIM, XAR and Z.
You may want to check out more Mac applications, such as iZip Unarchiver, The Unarchiver or Total Unarchiver Free, which might be similar to Unarchiver One.