Used in Anger - i.e. got paid to write it, and results were put to use for the intended purpose
Autocoder - Ferranti & KDF9
Algol 60 & 68
Fortran
PL/1
RTL/2
ADA
COBOL
Assemblers - various
RPG (on an LSI-11

)
C
C++
Dabbled with, or used on projects that failed to deliver
Modula-2
Smalltalk
Eiffel
GE Basic
C#