Strips, squares, triangles, diamonds ... I can do them all quickly using my Alto's QuiltCut2. If I only have a few then I use my regular rectangular or square rulers that have the correct angles marked on them. Very rarely do I need 'special rulers.' Though I do love the Fons & Porter red and blue trim guides [though that isn't what they are called] for trimming corners of triangles.
However, I do have a local plastic company that will cut templates of specific sizes, designs, and thicknesses for me. This is especially good for some curved designs. They aren't marked - no numbering or lettering - but make my life easier and their templates cost a whole lot less than what I could buy at a LQS or Joanns.
ali