Not software as such this time but some posters that I put together to encourage the girls in my all girls school to give serious thought to Design, Technology and Engineering. The women in these posters did so much to challenge the nonsense view that designing and making things is an exclusively male occupation.
The posters are in .PDF format but the original files are now included (at long last!) in their native .SVG format. They were created in Inkscape. You are welcome to use them for any non-profit purpose.
to download the Posters in either format, right click and "Save link as.."