Inspiring Quilters, Stitch by Stitch
https://www.softexpressions.com/software/misc/triangles.html this first link will take you to the download page for freeware/shareware etc with grid paper. when they had thier first one years ago i downloaded it...it was wonderful. well written no bugs.
https://www.softexpressions.com/software/dwnload.htm this link is to the softexpressions website. i found this one when i first started playing and learning to use the net. this has been on my saved links thru each computer my son has built for me...and it will go on the nxt pc too. one of the most invaluable sites, i believe, on the net for all things quilting sewing etc. i have downloaded several demos [usually good for 30days] and several freeware software items. never had an issue...never had junk fr the site...no bugs...excellent clean resource. vast site..take the time to explore and learn it. i also used this site when researching quilt design software. had gotten judy heim's book on web resources...but this site does the trick for me. i downloaded eq and all the design software programs avail at the time  all w/limited useability so that you could ck out the features that you would use the most. you can still do this ...go thru the lists of downloadable software on main page - second link above.