Glassboard: Annotate anything on a Mac

About

Glassboard let's you draw over anything on your Mac, across every app and every screen, Khan-academy style! Hold a keybind and draw. Release and it fades away. That's all! (well, except colors, shapes, a radial menu switcher and keybinds galore). But the basic concept is simple hold, draw, release, continue presenting without losing flow. No more wiggling my mouse pointer at what I want to highlight while screensharing. Try it at https://stem.ps/glassboard. Completely free and will stay that.