Lowtech Graph lists low-tech options for every need of a home. Here you can compare them, find tutorials to build them, and link them together into a circular system. Why low-tech?
Keeping daylight from becoming glare: a bright patch beside a dark one, which makes a screen unreadable and a room uncomfortable. It is a different problem from summer heat, and is solved inside the glass rather than outside it. The options differ in how much light they keep while cutting the dazzle.