https://bersavosh.github.io/research/tmsp_list.html
http://www.naic.edu/~pfreire/GCpsr.html
The Gravitational-Wave Candidate Event Database (GraceDB) is a service operated by the LIGO Scientific Collaboration. It provides a centralized location for aggregating and retrieving information about candidate gravitational-wave events. GraceDB provides an API for programmatic access, and a client package is available for interacting with the API.
http://quasars.org/HMQ.htm
Presents 1.16 billion optical objects in an all-sky downloadable catalog.
It maps large-survey radio and X-ray sources onto 1,002,855 optical objects.
https://www.cfa.harvard.edu/castles/
This covers a wide variety of sources.