AIFBcommons is a small bundle of little, commonly needed tools. In the future, it might get split further into sub-parts. Currently, it contains e. .g. iterators such as a ClosableIterator and its corresponding ClosableIterable. Both are used by RDF2Go.
The homepage URL of AIFBcommons is http://www.semweb4j.org/aifbcommons ( = this page).