cWB-6.4.0 - This is the third public version. This new release ( cWB-6.4.0 ) is a major upgrade of cWB: it fixes minor problems with the previous version and it introduces some new functionalities in the cwb_gwosc command. It is fully compatible (i.e. in terms of results) with the version used for the latest analyses/results on the LIGO and Virgo data collected during the Third Observing run O3.