=> Openboard is an open source cross-platform teaching application for interactive whiteboard designed primarily for use in schools and universities.
=> This application is build using HTML, CSS, JavaScript, Canvas API (for 2d graphical drawing), Socket.IO (For realtime drawing), Express (server).
=> This application includes some basic features like Draw (we can draw 2d graphical design), Erase (we can erase the drawing we made), Undo/Redo, Sticky Notes (we can keep sticky notes for us while teaching), Download board