You can use the openstreertmap.org tiles in the plugin Google Maps.

{mosmap tilelayer='http://tile.openstreetmap.org'| tileminzoom='0'| tilemaxzoom='18'| tileopacity='1'| tilebounds='51.0001625721, 3.0, 54.0, 8.00049916174'| zoom='6'| centerlat='52.5'| centerlon='5.5'| tilemethod='http://tile.openstreetmap.org/[Z]/[X]/[Y].png'}

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