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NuShell: a very nice shell I found today. What do you think?
(www.nushell.sh)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
If you want something more Unix like and less PowerShell (but absolutely not POSIX), checkout Elvish.