Description of a Project (DOAP) is an RDF schema and XML vocabulary to describe software projects, and in particular open-source. It was created and initially developed by Edd Dumbill to convey semantic information associated with open-source software projects. It is currently used in the Mozilla Foundation's project page and in several other software repositories.
There are currently generators, validators, viewers, and converters to enable more projects to be able to be included in the semantic web. Freshmeat’s 43 000 projects are now available published with DOAP.
Major properties include: doap:homepage, doap:developer, doap:programming-language, doap:os
Here's an example in RDF/XML:
Other properties include: Implements specification, anonymous root, platform, browse, mailing list, category, description, helper, tester, short description, audience, screenshots, translator, module, documenter, wiki, repository, name, repository location, language, service endpoint, created, download mirror, vendor, old homepage, revision, download page, license, bug database, maintainer, blog, file-release, and release
DOAP can be generated using doapamatic.