Sebastian writes: "This is not an announcement of specific software, but rather a heads-up on an open API specification and a bunch of associated free implementations. A group of Z39.50 developers have defined a general-purpose API for implementing Z39.50 clients. The API has been mapped onto a number of different programming languages, and several implementations exist. The API takes a lot of the pain out of Z39.50 client development and I'd recommend it to anyone new to Z39.50. More info at the ZOOM website ."