I didn't include it because in my experience people don't overlook seq, whereas they do overlook jot. I only included things where I've encountered people overlooking such tools and doing things the hard way.
Do I remember correctly that “jot” was also the name of a gui text editor on unix systems as well (different from the program referred to in the parent comment)? I think I used it in the early 90s on an SGI workstation running sun solaris OS.
* John A. Kunze's jot and rs
* John Kerl's mlr ("Miller")
* jq
* join and comm, as mentioned
* fmt
* ex
And, given what you just wrote:
* printf