Half square triangles are everywhere in quilting. They are not my favorite thing to cut and sew; I seem to stretch or otherwise warp them while making them.
Years ago (2005-ish?) when I worked at a family-owned local fabric chain, I spied the Triangulations (TM) 2.0 CD in our catalog and ordered a copy. It is a Mac and PC-compatible CD that allows you to easily make HST and quarter square triangle foundations in a variety of sizes.
You choose the size you need and print as many foundations as you need. It makes the cutting and sewing so easy! You cut out rectangles to fit your foundation, pin everything together, and sew on the arrowed lines.
Then you cut them apart on the remaining lines. Everything is accurate as well. The only time-consuming part is removing the foundations after cutting. In my opinion, it's worth it to have such accurate HST.
I checked the Bear Paw Productions website to make sure this product is still available. It is, and it has been seriously upgraded! It's now version 4.0. Same price, more than double the content. I am totally considering purchasing the upgraded version. Note: I am not a paid reviewer of this (or any) product. I just share things I am interested in that I feel are good buys.
I will be sharing the quilt top I made using Triangulations in the very near future.