With Padlet, you create a board for collaborators to post comments, answers, or notes. It is easy to use and can be customized to meet your needs. Padlet is web based and also is available as an android or iOS app. The free version is great to work with and you can upgrade to premium if you like.
CAN BE USED without an actual Jamboard Device!
The Jamboard app is part of Google for Education tools, so Jamboard can be used with Chromebooks, iOS and android devices. Jamboard looks and works like a whiteboard. You can draw with the tools or add text with sticky notes. Backgrounds can be changed and include graph paper grids.