gInk

After launch, the program places its icon in the system tray. To begin drawing on your screen, all you have to do is click the tray icon or press the global hotkey (Ctrl+Alt+G by default), which can be changed. gInk offers up to ten configurable pens, five of them enabled by default, along with an eraser. If you want to reach the desktop while sketching, you can switch to click-through mode, and you can also undo and redo strokes.

From the Options window, you can change the color, width, and transparency of each pen. Additionally, you can choose which tools or buttons appear on the toolbar. For instance, you may hide the buttons for the pan, pointer, eraser, snapshot and undo tools. At any time you can use the integrated snapshot tool to save your drawings: you select a region of the desktop and it is saved as a PNG file. The default output folder can be changed in the options.

Numerous elements of gInk are done well, and its user interface stands out in particular. It is a useful tool for people who need to highlight different objects or draw on their desktop, and it stays unobtrusive. The interface of gInk is designed to be as simple as possible so that it does not distract the presenter or the audience. Instead of adjusting the color, transparency, and tip width settings for each note as in other comparable software, you choose from a set of pens. Each pen combines these attributes and can be customized to meet your needs. gInk helps with presentations and demonstrations as well as with quick ideas that need to be noted next to something on your screen. The program is free and open source under the MIT license, and it is portable, so no installation is needed.

Lets you draw on top of any window or the desktop during presentations without installation or complex settings.

Features:

• Small and simple UI.
• Compatible with a touch screen, mouse, and stylus with an eraser.
• Click-through mode.
• Support for multiple monitors.
• Pen pressure support.