Indeed, Singular is very much alive. Singular version 3.1.0 is
about to be released, see
ftp://www.mathematik.uni-kl.de/pub/Math ... el/pre-3-1for a beta version. We apologize for answering your message
that late, but yes, we are very much interested in volunteers,
and in fact do have external collaborators.
Thank you very much for offering help! If you are still interested,
please contact me using
decker@math.uni-sb.de so that we can find out what your interests and preferences are.
We have a to do list with many interesting tasks!
I am very much looking forward to hearing from you and,
may be, other volunteers.
Wolfram Decker