We present the second data release (DR2) of the XXL Survey, contextually with the appearance of a second A&A special issue dedicated to XXL. This intermediate release includes the following catalogues and data: The X-ray point source catalogue (3XLSS) and the associated multiwavelength catalogues in the XXL-N and XXL-s areas (XXL paper XXVII). The same paper also provides the list of XMM pointings used, and a supplementary catalogue of redshifts obtained with the AAOmega spectrograph in the XXL-S area. The XXL-365-GC galaxy cluster catalogue (XXL paper XX) with the complete subset of clusters for which the selection function is well determined plus all X-ray clusters which are, to date, spectroscopically confirmed. The ATCA 2.1 GHz radio source catalogue in the XXL-S area (XXL paper XXVIII), together with the catalogue of ther optical and near infrared counterparts (XXL paper XXVI). The GMRT 610 MHz radio source catalogue in the XXL-N area (XXL paper XXIX). FITS images of the XXL-North field: continuum radio mosaic from observations with the Giant Meterwave Radio Telescope (GMRT) at 610MHz, and the corresponding noise map. A complete spectrophotometric sample of galaxies within X-ray detected, optically spectroscopically confirmed groups and clusters (G&C), including also field objects, in the XXL-N area (XXL paper XXII). The list of brightest cluster galaxies (BCGs) in the XXL-N area (XXL paper XXVIII). FITS images of the two radio galaxies described in XXL paper XXXIV. ATCA XXL-S source classification data (XXL paper XXXVI) http://sci.esa.int/xmm-newton/60686-tracing-the-universe-x-ray-survey-\ supports-standard-cosmological-model/ List of XXL DR2 papers: XVI. The clustering of X-ray selected galaxy clusters at z~0.3 XVII. X-ray and Sunyaev-Zel'dovich properties of the redshift 2.0 galaxy cluster XLSSC 122 XVIII. ATCA 2.1 GHz radio source catalogue and source counts for the XXL-South field XIX. A realistic population of simulated X-ray AGN: Comparison of models with observations XX. The 365 cluster catalogue XXI. The environment and clustering of X-ray AGN in the XXL-South field XXII. The XXL-North spectrophotometric sample and galaxy stellar mass function in X-ray detected groups and clusters XXIII. The mass scale of XXL clusters from ensemble spectroscopy XXIV. The final detection pipeline XXV. Cosmological analysis of the C1 cluster number counts XXVI. Optical and near infrared identification of the ATCA 2.1 GHz radio sources in the XXL-S field XXVII. The 3XLSS point source catalogue XXVIII. Galaxy luminosity functions of the XXL-N clusters XXIX. GMRT 610 MHz continuum observations XXX. Characterisation of the XLSSsC N01 supercluster and analysis of the galaxy stellar populations XXXI. Classification and host galaxy properties of 2.1 GHz ATCA XXL-S radio sources XXXII. Spatial clustering of the XXL-S AGN XXXIII. Chandra constraints on the AGN contamination of z > 1 XXL galaxy clusters XXXIV. Double irony in XXL-North. A tale of two radio galaxies in a supercluster at z = 0.14 XXXV. The role of cluster mass in AGN activity XXXVI. Evolution and black hole feedback of high-excitation and low-excitation radio galaxies in XXL-S

Cone search capability for table IX/52/atcasrc (ATCA XXL-S source view (Paper XVIII Butler et al. 2018A&A...620A...3B))

Cone search capability for table IX/52/xxl365gc (XXL-365-GC catalogue C1/C2 confirmed clusters (updated version) (Paper XX Adami et al. 2018A&A...620A...5A))

Cone search capability for table IX/52/xxlngal (Spectrophotometric catalog of galaxies (Paper XXII Guglielmo et al. 2018A&A...620A...7G))

Cone search capability for table IX/52/3xlss (The 3XLSS catalogue (Paper XXVII Chiappetti et al. 2018A&A...620A..12C))

Cone search capability for table IX/52/3xlsoptn (The 3XLSSOPTN XXL-N multiwave catalogue (Paper XXVII Chiappetti et al. 2018A&A...620A..12C))

Cone search capability for table IX/52/3xlsopts (The 3XLSSOPTS XXL-S multiwave catalogue (Paper XXVII Chiappetti et al. 2018A&A...620A..12C))

Cone search capability for table IX/52/xxlaaoz (XXL_AAOmega_16 redshift table (Paper XXVII Chiappetti et al. 2018A&A...620A..12C))

Cone search capability for table IX/52/xxlpoint (List of XMM pointings in XXL survey (Paper XXVII Chiappetti et al. 2018A&A...620A..12C))

Cone search capability for table IX/52/xxl_gmrt (GMRT XXL-N 610 MHz catalogue (Paper XXIX Smolcic et al. 2018A&A...620A..14S))

Cone search capability for table IX/52/xxlnbcg (BCG catalogue in XXL-N (Paper XXVIII Ricci et al. 2018A&A...620A..13R))

Cone search capability for table IX/52/list (Information on fits images of Paper XXXIV (Horellou et al. 2018A&A...620A..19H) and Paper XXIX (Smolcic et al. 2018A&A...620A..14S))

Cone search capability for table IX/52/list17 (Information on fits images and spectra of Paper XVII (Plionis et al. 2018A&A...620A...2M))

Cone search capability for table IX/52/atcaclas (ATCA XXL-S source classification data (Paper XXXVI, Butler et al. 2019A&A...625A.111B))

Cone search capability for table IX/52/atcacomp (ATCA XXL-S component view (Paper XVIII Butler et al. 2018A&A...620A...3B))