The Astro::ADS module is an OO Perl interface to the Astrophysics Data System (ADS) abstract service. The ADS is a NASA-funded project whose main resource is an Abstract Service, which includes four sets of abstracts: astronomy and astrophysics, instrumentation, physics and geophysics, and Los Alamos preprint server.
Astro::DSS Module is an object orientated Perl module that provides an interface to both the first and second Digital Sky Surveys at the ESO-ECF online archive. While the first sky survey is 100% complete, the second survey covers 98% of the sky in Red, 45% of the sky in Blue, and 27% of the sky in Infra-red.
Astro::Aladin is a an object-oriented interface into the resources provided by the CDS Aladin project. The Aladin Java application is driven in script mode using an anonymous pipe, while high level access to resources is provided by the module which disguises the mechanics of the data access.
With the demise of wm.current.nu there is currently no central repositary for the wterm code and, after recently upgrading the linux distribution on my laptop, I couldn't find any pre-built RPM binary packages that didn't use a fairly old revision of the source. So in the end, I built my own. You can find the source code for wterm v6.2.7 and and RPM for RH7.x from http://www.astro.ex.ac.uk/people/aa/pages/computing/wterm.html.