Integrated DNA Technologies (IDT) is a company that manufactures and sells oligonucleotides (short, single-stranded DNA or RNA molecules). On their website, they provide the Oligo Analyzer service, which can be used to examine an oligonucleotide (oligo) in a variety of ways. This service is primarily available through a web interface, but the Analyze, Hetero-Dimer, and Self-Dimer functions are also available as SOAP functions.
The Analyze service returns physical properties of a given oligo sequence. The Hetero-Dimer examines possible duplexes when one oligo is combined with another. The Self-Dimer reports possible duplexes and their stabilities when an oligo hybridizes with itself.