  We present the Spitzer Data Fusion, a database incorporating far-ultraviolet
to far-infrared flux measurements as well as photometric and spectroscopic
redshifts for 4.4 million IRAC-selected sources detected over 8 extragalactic
fields covering 65 deg$^2$ observed by Spitzer in all IRAC and MIPS bands
during its cryogenic mission. Deeper Spitzer observations carried out during
its warm mission over 5 sub-fields as part of the SERVS project are also
presented and analysed in a similar fashion, detecting 2.8 million
IRAC-selected sources over 18 deg$^2$ and merging them with multi-wavelength
catalogues within the SERVS Data Fusion. When combined with Herschel SPIRE
surveys and radio continuum observations over the same fields, the Spitzer Data
Fusion and the SERVS Data Fusion provide an invaluable resource for
multi-wavelength galaxy formation and evolution studies at
infrared/millimetre/radio wavelengths. The catalogues and their future updates
will be released at http://www.mattiavaccari.net/df/ and on CDS/VizieR.
