The GlycamWEB Online Carbohydrate Builder is a free service for the generation of files containing structural information for oligosaccharides. A wide variety of novel or custom oligosaccharide structures can be constructed using the builder. Since they are constructed using information contained in the GLYCAM06 force field (GLYCAM04EP coming soon!), the structures approximate well solution conformations. Of course, oligosaccharides are highly flexible and populate many conformations in solution, so the structures returned here should be regarded as one of many valid structures. The builder interface is quite intuitive, but new users will benefit from reading through the help available on the builder page.