VO tools at CDS
Résumé
The CDS services, SIMBAD, VizieR, and Aladin, are important building blocks of the Virtual Observatory. Collaboration with VO projects, in the European Astrophysical Virtual Observatory consortium, and with the US National Virtual Observatory framework project, VO-India initiative, and other efforts, has been very fruitful in the last years. New functionalities (e.g., catalog filtering, cross-identification, access to real pixels, multiview) have been developed, in particular from the feedback of VO users, scientists and projects. They are progressively made available in the CDS services.