Today in #FreeSoftwareAdvent it's Inkscape. I've used it for years, for generating meme-type images, for producing my resume, for several portfolio projects, drafting SVG source images for laser-cutter/3d-printer work, and likely dozens of other projects I'm forgetting at the moment.
Having implemented a *tiny fraction* of a vector image editor/viewer (in VB6 for the PocketPC using custom XML data-structures under the hood…so early-2000s), I appreciate all the more the hard work done by the Inkscape devs.