All answers for Knowledge of computer algebra systems

AXIOM
Bertfried Fauser
Aldor
Jacques Carette
All of it
OpenAxiom
Axiom
Bill Page, Jacques Carette, Oziewicz Zbigniew, Ralf Hemmecke
FGb
Rafal Ablamowicz
Maple
Bertfried Fauser, Bill Page, Jacques Carette, Rafal Ablamowicz, Ralf Hemmecke, Raymond Rogers, William Sit
Mathematica
Jacques Carette, Ralf Hemmecke, William Sit
Matlab
William Sit
Maxima
Raymond Rogers
OK
Mascari
OpenAxiom
Yixin Cao
SCHUR
Bertfried Fauser
Singular
Bertfried Fauser
Singular:Plural
Rafal Ablamowicz
User level -- not an implementer
M. Edward (Ed) Borasky
Various. A research area of mine.
Stephen M. Watt
axiom
William Sit
interested in AXIOM
Bill Wood
some Axiom
Raymond Rogers
use maxima a little
Bill Wood
used derive
Bill Wood