The 3U Catalog was the first catalog of X-ray sources, published in 1970.

The ROSAT All-Sky Survey is the largest X-ray survey ever conducted, and contains over 100,000 X-ray sources.

The Chandra Source Catalog is a catalog of X-ray sources detected by the Chandra X-ray Observatory.

The XMM-Newton Serendipitous Source Catalog is a catalog of X-ray sources detected by the XMM-Newton X-ray Observatory.

The Swift XRT Catalog is a catalog of X-ray sources detected by the Swift X-ray Telescope.

The INTEGRAL IBIS Catalog is a catalog of X-ray sources detected by the INTEGRAL X-ray Observatory.

The NuSTAR Hard X-ray Catalog is a catalog of X-ray sources detected by the NuSTAR X-ray Observatory.

The eROSITA All-Sky Survey is a catalog of X-ray sources detected by the eROSITA X-ray Observatory.

The Athena All-Sky Survey is a catalog of X-ray sources that will be detected by the Athena X-ray Observatory.

The Lynx All-Sky Survey is a catalog of X-ray sources that will be detected by the Lynx X-ray Observatory.

The XRISM All-Sky Survey is a catalog of X-ray sources that will be detected by the XRISM X-ray Observatory.

The SVOM All-Sky Survey is a catalog of X-ray sources that will be detected by the SVOM X-ray Observatory.

The THESEUS All-Sky Survey is a catalog of X-ray sources that will be detected by the THESEUS X-ray Observatory.

The AXIS All-Sky Survey is a catalog of X-ray sources that will be detected by the AXIS X-ray Observatory.

The ILO All-Sky Survey is a catalog of X-ray sources that will be detected by the ILO X-ray Observatory.