Free engineering tools
Working tools for the questions that come up before a drawing exists. Each one shows its formula and its sources on the page, keeps its state in the address bar so a result can be linked, and can be embedded on your own page.
Missing a tool you would use? Say which question it should answer, at support@interconnix.com.
Past the estimate and into a drawing?
Send the drawing or the requirement and the quotation comes back with the plan written in.