The best alternatives to Keka are Alternativeto Net, Unarchiver, and Informant. If these 3 options don't work for you, we've listed a few more alternatives below.
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ArchiveBox is a powerful, self-hosted internet archiving solution to collect, save, and view sites you want to preserve offline.
You can set it up as a command-line tool, web app, and desktop app (alpha), on Linux, macOS, and Windows. You can feed it URLs one at a time, or schedule regular imports from browser bookmarks or history, feeds like RSS, bookmark services like Pocket/Pinboard, and more. See input formats for a full list.
It saves snapshots of the URLs you feed it in several formats: HTML, PDF, PNG screenshots, WARC, and more out-of-the-box, with a wide variety of content extracted and preserved automatically (article text, audio/video, git repos, etc.). See output formats for a full list.
The goal is to sleep soundly knowing the part of the internet you care about will be automatically preserved in durable, easily accessible formats for decades after it goes down.
The Unarchiver is a proprietary freeware data decompression utility, which supports more formats than Archive Utility (formerly known as BOMArchiveHelper), the built-in archive unpacker program in macOS. It can also handle filenames in various character encodings, created using operating system versions that use those character encodings.
I was tired of pressing ⌘ + i all the time so I built this! It monitors clicks, and arrow key presses to keep track of the currently selected file. It displays all the metadata found in the menu bar or in the panel inspector.