DXView will display the location of a gridsquare, either on its own built-in world map, or on DX Atlas. If you run DXView and DXKeeper together, then clicking on a QSO logged in DXKeeper will highlight the QSO's gridsquare (if logged) on the DXView or DX Atlas map.
Having DXView highlight all worked/confirmed/verified gridsquares logged in DXKeeper is not yet supported, but is "on the list".
DXView and DXKeeper are both members of DXLab, a freeware suite of DXing applications that work individually but automatically interoperate when run at the same time. All are available via www.qsl.net/dxlab