HairTG - Strand for Substance Designer is a tool to create pattern-based curved shapes by manipulating control points directly in the 2D view. It is a limited version of HairTG - Hair & Fur Freestyle (part of the HairTG -Hair & Fur https://www.artstation.com/artwork/xzeDe2) supporting a single strand. It features the same outputs as the other HairTG tools so you can create flow maps with it as well as other maps.
It is available on the following stores for free:
If you need the full featured version, check the HairTG - Hair & Fur: https://www.artstation.com/artwork/xzeDe2