DesignTheory.org is the official website of a research project hosted at the School of Mathematical Sciences at Queen Mary, University of London, and funded by the UK Engineering and Physical Sciences Research Council. The goal of the project is "to cover theoretical, computational, and statistical aspects of combinatorial designs" and to develop an online database of various resources for Design Theory. The library includes an Encyclopaedia of Design Theory (which is still under development), documentation on The External Representation of Designs, and various preprints, research reports, and books. The site also provides a database of (binary, connected) block designs and free software packages for the creation, analysis, and application of combinatorial/statistical designs.