Limnu is a whiteboard and collaboration software that helps teams of all sizes share and discuss ideas and workflows remotely. It comes with a built-in instant messaging and video conferencing tool, which allows team members to establish quick communication. It lets you utilize the drag-and-drop interface to upload images and files in multiple file formats, including PDF, JPEG, GIF, SVG, Excel, and PowerPoint. With virtual pens, erasers, labels, pins, and notes, users can create and highlight content on a centralized platform. It enables teams to export content screenshots with opaque backgrounds, images, notes, labels, and pins. There is also an educator plan that is available. Read more here.
Limnu is good for teaching students remotely. It does a lot more than give realistic marker drawings: it also includes collaboration features that make the jump to teaching online feel much easier. To invite others to view your board, click on the share icon and copy/paste the link. You can even limit their permissions to view-only, if you want. Since your virtual students don't need to go through a lengthy signup process to join your whiteboard, you don't have to worry as much about tech headaches blocking your teaching session.