Autodesk +

Windows/Mac some require 64bit but some have 32/64bit option for download.

Three years of Autodesk software for students with .edu emails. Either use a real school email or if you don't have one and you're a student, try searching for an online based one. Not sure if it …

ConceptDraw is a technical drawing software. It features vector drawing with a variety of clipart, text tools, and more. It usually retails for ~$200 USD. Skip the official link, download the …