V-q doesn't offer any client library, there's no such need. All operations are represented by ivq interface.
This means that you can use system from any language that has an IDL mapping. At this time almost all popular languages has it, i.e.: C, C++, Java, Smalltalk, PHP, python, PERL.
This has also another advantage - clients doesn't have to run with privileges of ivq or iauth. They can be run by any user (depends on configuration).