Keka is a free file archiver for macOS and is used for all the files stored on this website.
Through a very slick interface and a drag and drop approach (both via the open app or the dock icon), it allows you to compress files in multiple formats; 7z, Zip, Tar, Gzip, Bzip2, DMG, ISO. Keka also supports many compression formats for extraction; RAR, 7z, Lzma, xz, Zip, Tar, Gzip, Bzip2, ISO, EXE, CAB, PAX.
Keka also supports encrypted archives meaning you can password protect compressed files, as well as split archives — handy when you have file size limitations such as using WordPress!