GMask is a program used to mask/unmask parts of an image in various different ways. It is common on imageboard type communities and often used for censorship of pornographic materials.
GMask is written by Tsuyoshi Furumizo. The last version was published in the late 1990's.
This is not a common application, but should be included for completeness.
There is no help file however this site: has a rough user guide.

Application Details:

Developer: Tsuyoshi Furumizo

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For more details and user comments, view the versions of this application

VersionDescriptionLatest RatingLatest Wine version testedTest resultsComments
1.70Version 1.70Platinum1.3.1020
2.0Version 2.0Platinum1.1.2510