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Dendrimer Builder Toolkit (DBT)
  DBT version 3 available here
  New libraries and simulated structures uploaded here

DBT can be used to build polymer (linear or hyperbranched) in AMBER depending upon
multiplicity of joining residues (For more details please see tutorial and refer article: J. Comput. Chem. 2012, 33, 1997-2011). Thus DBT is a graphical user interface (GUI) written in PERL-Tk, which generates a set of commands (xleap/tleap) to be used further by AMBER. DBT has been integrated with AMBER10. DBT sequences and calculates the number of residues required for building dendrimer (or polymer), which further depends on core multiplicity and generation of dendrimer.  

Please refer:

Dendrimer Building Toolkit: Model Building and Characterization of Various Dendrimer Architectures
J. Comput. Chem., 2012, 33, 1997-2011
Vishal Maingi, Vaibhav Jain, Prasad V. Bharatam, Prabal K. Maiti

System requirements: Linux, PERL-Tk, AMBER10, AMBERTOOL1.2 (You can try on other versions of AMBER (11 or 12), but DBT was used and tested with the mentioned versions)