I discovered Flutter the other day . It’s a fairly new product, but it looks extremely promising. I used ExpressionEngine a little at my last job, and it was okay. I wasn’t too impressed with it though, considering you have to pay a per-site fee. That, and there was a ton of EE only functions and tags to learn.
Flutter promises to bring some of the nice features of ExpressionEngine to the WordPress scene, absolutely free. That’s good news, I look forward to experimenting with the plugin in the near future.
Here’s a video showing how easy it is to set up custom write panels: