Turtlestitch us a free Open Source online software with the goal of connecting programming with digital embroidery.
If you want to use Turtlestitch to create your embroidery designs, you can create them in Turtlestitch and export them as an svg file, then import them into Inkstitch and give the desiembroidery properties there. It is possible to export a dst file from Turtlestitch, but there is better control with an svg file in Inkstitch.