I'm going to add "thought leader".
I first looked at Awesomium because it had a Unity3D interface [1], but that's gone stale (Awesomium doesn't support 64 bits, much has changed in Unity since then, not to mention Chrome itself), and some developers on the Unity discussion groups were suggesting CEF as an alternative. [2] [3]
I'm interested in integrating the latest CEF with the latest Unity3D on Mac and Windows desktop, as well as for consoles.
There are (non-Unity-specific, i.e. maybe too complex and modern) C# wrappers for CEF [4], which looks pretty elaborate, but I think it would be tighter to integrate the CEF C++ code directly as a native Unity extension, without thunking through too much Windows-oriented C# glue that might not be compatible with Unity's older version of C#.
On iOS I'm simply using WkWebKit, and WebKit on Chrome, which both support off-screen rendering.
Here's some interesting stuff comparing Awesomium and CEF and other stuff from Stratoscope. [5] It's from a 446 day old thread about CefSharp [6] so it might predate the Awesomiumocalypse. The thread is interesting reading! Really makes me wonder why Awesomium is on the list at all.
It looks like Coherent UI is a commercially supported alternative to Awesomium, but I haven't looked into it yet. Their employee said good things about CEF and offered some fair criticism:
"Hi, Stoyan from Coherent Labs here. My impressions of CEF are very good. They manage to keep it very close to the chromium HEAD, which is great. The only technical downside of CEF is the imperfect GPU acceleration. In many cases however the architecture of chromium itself is a hindrance. Their processes hog memory like crazy and introduce perceivable lag. We had to write a complete new product to solve the issue for games." [7]
[1] http://labs.awesomium.com/unity3d-integration-tutorial-part-...
[2] http://answers.unity3d.com/questions/945207/unity3d-v5-aweso...
[3] http://gamedev.stackexchange.com/questions/111846/chromium-e...
[4] https://github.com/cefsharp/CefSharp
[5] https://news.ycombinator.com/item?id=10089645
I'm using it for off-screen rendering. It's pretty straightforward, once past the inevitable initial hump. The code is sensible (if a little smart pointer-happy), and you're provided with a good range of hooks. Documentation is OK. Nothing you can't figure out if you've got a debugger...
(I used Visual Studio with the prebuilt Spotify builds. This addin really helps: https://visualstudiogallery.msdn.microsoft.com/a1141bff-463f...)