How do you create charts / diagrams for your blog posts?

Anyone know of a good library / site for creating sleek looking diagrams for technical blog posts?

I was impressed by the charts on this blog post but wasn't able to find out what he's using (he didn't answer me on twitter :) )

Comments

[Dan Silcox]

Draw.io is good

[Lou (🚀 Open Up The Cloud ☁️)]

cloudcraft.co/ is a good one!

[Shehan Perera]

Creately.com has a good library for creating diagrams