It is easy to find some packages for data structures such as list, heap, etc on Internet. There is a GNU libavl for balanced binary trees. However, there is no GNU package for lists etc (see http://directory.fsf.org/GNU/). Are there too many already that people do not bother to contribute one to GNU? I may be wrong, but being on the GNU list somwhat lends credibility to a library. Can anyone recommend a good, or widely used, library for data structures such as lists and queues? I do not want to reinvent the wheel; on the other hand, I want something reputable. Thanks.