| Ace | Database object interface to ACeDB servers |
| BiblioI | An interface to a Bibliographic Query Service |
| BioFetch | Database object interface to BioFetch retrieval |
| DBFetch | Database object for retrieving using the dbfetch script |
| EMBL | Database object interface for EMBL entry retrieval |
| Failover | A Bio::DB::RandomAccessI compliant class which wraps a priority list of DBs |
| Fasta | - Fast indexed access to a directory of fasta files |
| FileCache | In file cache for BioSeq objects |
| Flat | Interface for indexed flat files |
| GDB | Database object interface to GDB HTTP query |
| GFF | - Storage and retrieval of sequence annotation data |
| GenBank | Database object interface to GenBank |
| GenPept | Database object interface to GenPept |
| ID_Iterator | |
| InMemoryCache | Abstract interface for a sequence database |
| NCBIHelper | A collection of routines useful for queries to
NCBI databases. |
| QueryI | Object Interface to queryable sequence databases |
| RandomAccessI | Abstract interface for a sequence database |
| RefSeq | Database object interface for RefSeq retrieval |
| Registry | Access to the Open Bio Database Access registry scheme |
| SeqI | Abstract Interface for Sequence databases |
| SwissProt | Database object interface to SwissProt retrieval |
| Universal | Artificial database that delegates to specific databases |
| UpdateableSeqI | An interface for writing to a database of sequences. |
| WebDBSeqI | Object Interface to generalize Web Databases
for retrieving sequences |
| XEMBL | Database object interface for XEMBL entry retrieval |
| XEMBLService | SOAP service definition for XEMBL |