Here is the augmented and updated list. This should be a good starting point for further improvements.
This list is very optimization-heavy (even the automatic differentiation software is most likely to be used by O.R. people in support of nonlinear optimization). So perhaps some additions outside optimization would be warranted, as well as machine learning tools.
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**ADiMat (matrix level automatic differentiator in MATLAB)**: Mailing list at https://lists.sc.informatik.tu-darmstadt.de/sympa/info/adimat-users
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**AIMMS**: http://groups.google.com/group/aimms
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**ALGOPY (Automatic differentiator in Python)**: https://groups.google.com/forum/#!forum/algopy
- AMPL: http://groups.google.com/group/ampl
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**CasADi**: https://groups.google.com/forum/#!forum/casadi-users
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**COIN-OR** List of mailing lists at [http://list.coin-or.org/mailman/listinfo](http://list.coin-or.org/mailman/listinfo),<br> main page at https://www.coin-or.org/
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**CPLEX**: https://community.ibm.com/community/user/datascience/communities/community-home/digestviewer?CommunityKey=ab7de0fd-6f43-47a9-8261-33578a231bb7 **Legacy forum** ht
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**CP Optimizer**: [IBM Forum](http://ibm.biz/ConstraintProgForums), [StackOverflow](https://stackoverflow.com/questions/tagged/cp-optimizer)
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**CVX**: http://ask.cvxr.com/
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**CVXPY**: https://groups.google.com/forum/#!forum/cvxpy
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**GAMS**: https://forum.gamsworld.org/ and http://www.gams.com/maillist/gams_l.htm
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**Gurobi**: [https://support.gurobi.com/hc/en-us](https://support.gurobi.com/hc/en-us) (before 04/2019: [Gurobi Optimization](https://groups.google.com/forum/#!forum/gurobi) @ Google Groups)
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**JuMP**: https://discourse.julialang.org/c/domain/opt
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**KNITRO**: http://groups.google.com/group/knitro
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**MANOPT (optimization on manifolds)**: https://groups.google.com/forum/#!forum/manopttoolbox
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**MATLAB**: http://www.mathworks.com/matlabcentral/answers/index
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**MiniZinc**: https://www.minizinc.org/forum.html
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**MOSEK**: http://groups.google.com/group/mosek
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**MPT (Multiparametric Toolbox)**: https://groups.google.com/forum/#!forum/mpt-user
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**NEOS**: https://neos-server.org/neos/help.html
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**OPL**: https://www.ibm.com/developerworks/community/forums/html/forum?id=11111111-0000-0000-0000-000000002053
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**OptaPlanner (Java, open source)**: [Google Group](https://groups.google.com/forum/#!forum/optaplanner-dev) - [others (issue tracker, StackOverflow, ...)](https://www.optaplanner.org/community/getHelp.html)
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**Optimization Services (COIN-OR project)**: http://groups.google.com/group/optimizationservices
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**OPTI Toolbox**: https://groups.google.com/forum/#!forum/opti-toolbox-forum **Effective June 7 2019, OPTI Toolbox Development has ended and the Google group is now read only**. See https://groups.google.com/forum/#!topic/opti-toolbox-forum/dR6x-1gBMkA .
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**OR-Tools:**: http://groups.google.com/group/or-tools-discuss
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**PuLP**: https://groups.google.com/forum/#!forum/pulp-or-discuss
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**PYOMO**: https://groups.google.com/forum/#!forum/pyomo-forum
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**Python-MIP**: https://groups.google.com/forum/#!forum/python-mip
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**QuanDec**: http://www.cassotis.com/quandec
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**SAS/OR** http://communities.sas.com/t5/Mathematical-Optimization/bd-p/operations_research
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**SCIP**: Use SCIP tag on [https://stackoverflow.com](https://stackoverflow.com/questions/tagged/scip),<br> mailing list at https://listserv.zib.de/mailman/listinfo/scip/
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**SciPy**: https://groups.google.com/forum/#!forum/scipy-user
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**SNOPT** https://groups.google.com/forum/#!forum/snopt
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**Xpress** https://community.fico.com/s/optimization-user-forum
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**YALMIP**: http://groups.google.com/group/yalmip