Draw.io - Online free diagrams. I use it to explain things (like on the whiteboard), UML and Architecture diagrams, it has even the AWS/GCP icons.
(not so free) zoom.us It has a limited free tier, is like Skype/Hangouts but it has a special feature: a drawing whiteboard, which is great for collaboration talks.
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I forgot to add
Draw.io - Online free diagrams. I use it to explain things (like on the whiteboard), UML and Architecture diagrams, it has even the AWS/GCP icons.
(not so free) zoom.us It has a limited free tier, is like Skype/Hangouts but it has a special feature: a drawing whiteboard, which is great for collaboration talks.