Nicely done game menus are also a important element of game design, have you noticed that?
This one shows a example of smooth menu highlighting, which gives a nice feeling to the game.
Example is made in gm7lite.

Tile system, similar to the one warcraft 3 uses. So it gives you nice blending perspectives and one-code-line dynamical changing of tiles without losing any fps.
Developed for using in top-down games.

A example of system that generates a random maze, mostly hard one.
It is average commented, but it does not require understanding of concepts of it's work to be used (all simple - you call a function and get a maze).

A simple tds engine which includes shooting, weapon changing, several kinds of ai, has good depthsorting, and is made in gm7lite.

Slopes. One of those typical newbie's problems.
This example shows you a well commented way of making perfect slope movement.

Just a nice platform engine of .V. Platform series standart.
Includes similar animation engine, unlagged collision system, moving platforms, keys & doors, sample enemy, collectable things and some more.

A example of script for detecting tile positions in isometrical grid.
Usefull for building pathfinding systems in iso worlds.