Grock

Grock is a Linux desktop application by Daniel Burgess for viewing geological maps of the United Kingdom. Rather than a general mapping program that happens to include geology, its subject is fixed: the interface exists to bring UK geological map material onto the screen for reading and inspection.

That focus draws the boundaries plainly. Coverage stops at the UK, so it offers nothing for fieldwork or teaching about other regions, and the packaging targets Linux, which leaves users of other desktop systems without a build. Anyone expecting a full GIS — layer authoring, editing, survey data entry, coordinate transformation between arbitrary projections — should consult the project's own documentation before assuming those functions exist, since the stated purpose is display.

It is distributed under GPL-3.0-or-later, so the source can be inspected and adapted under the same licence.