This cross can be viewed either as just the outline - a Voided Cross, or as a solid White Cross.
(On this website we are using the same image for both the Voided Cross and the White Cross, although the Voided Cross usually has a heavier border. Whether a cross is termed 'voided' or 'white' depends less on the thickness of the lines, and more on the function or interpretation of the cross; as explained below.)
There are innumerable societies and groups that use the name White Cross, including several altruistic organisations, such as:
Another use of the name White Cross was for a rather nasty chemical bomb deployed in the First World War. This ordnance was designed to disable the enemy by irritating eyes and other moist tissues. The bombs were identified by a white cross painted on the artillery shell casing, which was easier than printing the contents: bromoacetone, bromobenzyl cyanide, bromomethyl ethyl ketone, chloroacetone, ethyl bromoacetate, and xylyl bromide. Other gases were used and their shells painted with different distinguishing colours. (See Yellow Cross, Blue Cross and Green Cross.) Victims of the gassing prompted the formation of specialist medical corps and research organisations which continue today. (See Lorraine Cross and the American Lung Association.)