Database of records is not publicly accessible or searchable, but API info suggests it might be accessible to developers through the API http://www.zotero.org/support/dev/start.

Related to arXiv.  A lot of technical information about the system, not much else.

Will be translated into more languages. "The complete thesaurus, or any substantial part of the thesaurus, may not be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise without the permission of the copyright holder."

Thesaurus contains geographical names, names of historical periods and events, names of characters from literature, mythology and religion; does not contain personal names and names of institutions.