Well looking at software for images, for the 2D technical stuff I use Qcad and no issues here but what about producing images for documentation, yes we have Adobe products but at a price that I no longer want to pay, it is now a monthly cost rather than a one of hit for as long as the product suits you and I have done some odd task using the drawing tools in Excel but it is not efficient and rather clumsy so who is using what if anything ? I am not looking at full blown technical drawings but rather an image that is representative.