Another interactive board application you can use online is explain everything. Although this application stands out by allowing you to access it online from anywhere, the free version can be difficult for those who teach in different lessons with many classes, as the free version allows up to 3 boards. However, if you say I do not save anything, you can use the system without even being a member. Let's not forget that you can also use it by pairing with your mobile devices. You can experiment on explaineverything.com site.