Grand Camelot Board
This board is a bit more specialized in the games it plays, but still surprisingly versatile. At its heart is a 10 by 10 grid (larger than the other grid boards which only go up to 9 by 9). Surrounding that is the Camelot board and the go board. At the extremities is the grand Camelot board. If you're unfamiliar with Camelot (and a fan of abstracts) you should really check it out. With this board, the Camelot pieces (in this case they're from an 80s reprint called "Inside Moves"), and the go stones you can play a bunch of games. Some of my favorites are amazons and barca. Check out this geeklist.
Patrons get access to jpeg and tiff files of the board so they can print their own. They also get to make suggestions for new boards and design ideas. Join here: Singularity Games Patreon
Camelot & Grand Camelot
The large weirdly shaped grid is for playing Camelot (aka Inside Moves). Camelot is an amazing two player abstract designed by George S. Parker of Parker Brothers fame back around the early 1930s. It shares some similarities to checkers, but in my opinion is much more interesting. The dotted grids (on the left and right of the board) are for playing a 4 player variant called Grand Camelot. You can learn more about the game here: http://www.worldcamelotfederation.com/
10 by 10 Grid
A 10 by 10 grid is marked in the center of the board. With this you can play a variety of games including a favorite of mine called Amazons (BGG: https://boardgamegeek.com/boardgame/2125/amazons).
13 by 13 Go can be played on the corners of the grid, indicated by small circles.