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7-Zip is a free, open-source archiver that creates and extracts 7z, ZIP, TAR, GZIP and other formats, and opens RAR and many more formats for extraction only. The Windows version has a graphical file manager with shell integration, while the Linux and macOS downloads are console versions. The official page says you do not need to register or pay, even in a company.

Good to know: Requires desktop installation.

PeaZip is a free, open-source archiver with a graphical interface for Windows, macOS and Linux. It opens and extracts RAR, TAR, ZIP and many other archive types, and creates formats such as 7Z, ZIP, TAR and Zstandard; creating RAR files works only when WinRAR is installed on the computer. Portable packages need no installation. The site says the packages are currently not signed and publishes a SHA256 hash for each; on macOS you run one Terminal command after copying the app to remove its quarantine flag.

The Unarchiver is a free macOS app from MacPaw that extracts RAR, ZIP, 7z, Tar, Gzip and many older archive formats, including encrypted and multi-volume RAR files. The official page lists extraction formats only and does not describe creating archives. It requires macOS 10.13 or later and states there are no in-app purchases for additional features.

Good to know: Requires desktop installation.

Keka is a macOS file archiver: drop files onto its window or Dock icon to create 7Z, ZIP, TAR and other archives, or use it to extract RAR, ZIP, 7Z and many more formats. The official page describes AES-256 encryption for 7z files and older Zip 2.0 encryption for ZIP files, and lets you split large archives into pieces. You can download it from the website, or buy the same app from the Mac App Store to support development.

Good to know: Requires desktop installation.