InVision Studio - The world’s most powerful screen design tool
Epic Pen - A windows tool for drawing over your desktop and applications
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
gInk - An on-screen on-screen annotation software for Windows.
InVision Studio for UI Designers - Free video course on InVision Studio
Gromit-MPX - Create annotations by directly drawing on your screen.