PDBManip
PDBManip is a free program for editing PDB (Protein Data Bank) Files
...However, in developing PDBManip, I have customized scripting language, by adding predefined PDB related variables and functions, in such a way that a user with a very basic knowledge of programming can easily write very eligible scripts, even for very complicated editing and manipulating tasks. In this way, proficiency in computer programming, that is a must in using Awk or Perl, is not a barrier.