I have the Trianglation software, it's great.
I use the WonderCut ruler, it's great.
I use the Thangles, it's great.
June Taylor and Eleanor Burns rulers are great.
I use the Accucut Go the most. It's super great.
The Tiger Tape method is very easy but expensive to do a lot. and my friend sent me something new called Stitching Lines and I have used it a lot for more then just HST. there are two you tube videos how you can use Stitching Lines:
http://www.youtube.com/watch?v=B3BVwTiNnWM