Grid Drafter is a lightweight utility for managing two-dimensional integer grids.
It can handle either square or hexagonal grids.
Pressing keys 0-9 sets the data to be stored in a cell when you click on it.
Each number is displayed as a different color.
Grid Engine (C++) is a C++ templated data structure for storing grids of information.
The grids may be connected in a D4 (Manhatten),
or hexagonal sense.
The grids may also wrap toroidally so their edges are connected.