Programming languages Hall of Fame
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Here is my (very subjective) list of programming languages that I consider
the most underrated, overlooked and offering the most value for their 
standardized specs (if there are any) and reference implementations. Note 
that I won't distinguish between compiled/interpreted languages, different 
execution models and specific flavors/versions/dialects here (unless this is 
absolutely necessary, in which case I'll put the details in a footnote), 
just list the names in no particular order.

* Bash ([1])
* AWK
* dc
* bc
* Lua ([2])
* ANSI C89 ([3])
* Red ([4])
* VTL-2
* Forth
* Uxntal
* Scheme ([5])
* Tcl
* TRAC ([6])
* PostScript
* OCaml
* Nim

Bonus: VMs Hall of Fame
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Here is a (smaller) list of virtual machines and their architectures that I
consider no less underrated than the programming languages listed above.

* Uxn
* CHIP-8
* TIC-80
* Glulx
* SWEET16
* BytePusher
* Subleq ([7])
* FlipJump

--- Luxferre ---

[1]: version 4.3 and up
[2]: version 5.3 and up
[3]: it's really strange that we have come to this point when I have to put
C89 into the list of the most underrated and overlooked programming 
languages...
[4]: https://www.red-lang.org/p/about.html - I hope it doesn't die
[5]: R5RS is fine, as well as any of its subsets or implementations like Guile
[6]: namely, the T-64 standard and every known derivative of it
[7]: do not underestimate this architecture - someone has implemented it in
34 SLOC of C89, which can easily be optimized to 20 SLOC at most, and then 
run eForth on top of it: https://github.com/howerj/subleq