Lucidchart is pretty awesome. I have been using Luicdpress over the years for various things. They have done a good job of building some really great cloud based tools. @steevc is pretty legit here. It took me a while to get him to notice me, but we have grown into pretty decent online friends over the years. He's about the only person I know who says he doesn't do Hive for the money and I actually believe him :)