Well, this is not specifically for utilities in the sense of scripts in a file, ...

vram22 on April 6, 2017 | parent | context | favorite | on: Fun at the Unix Terminal

Well, this is not specifically for utilities in the sense of scripts in a file, or compiled binaries, but commandlinefu.com has many Unix one-or-more-liners.

http://www.commandlinefu.com/commands/browse