| Build | A common Module::Build subclass base for BioPerl distributions |
| Exception | Generic exception objects for Bioperl |
| HTTPget | module for fallback HTTP get operations when
LWP:: is unavailable |
| IO | module providing several methods often needed when dealing with file IO |
| Root | Hash-based implementation of Bio::Root::RootI |
| RootI | Abstract interface to root object code |
| Storable | object serialisation methods |
| Test | A common base for all Bioperl test scripts. |
| Utilities | General-purpose utility module |
| Version | provide global, distribution-level versioning |