Stride (formerly known as Xenko) is a free and open-source C# game engine. It is growing quickly and is supporting multiple platforms, with more to come.
News can be found here: https://stride3d.net/blog/
Ranked in these QuestionsQuestion Ranking
Pro Good looking and fast
Looking nearly as good as Unreal Engine 4, but rendering significantly faster.
Pro No royalties or licensing fees
Pro Straightforward editor
Stride provides a simple and clean working environment for designing games.
Pro Very modern render engine
Pro Community seems friendly and is growing
Pro Engine AND Scripting are both C#
Since the engine is written in the same language as the scripting, there is no weird mix of technologies as other engines have.
Pro Supports Vulkan
Currently the only well known open-source game engine that supports Vulkan, and probably one of the only.
Pro Projects are normal Visual Studio solutions
No proprietary project format, so it works with all the official .NET tooling.
Pro Supports Visual Studio
Pro Easy to learn and use C#
Pro Multiple Starter Templates
The engine comes packed with multiole example projects to help you get started.
Pro Powerful 3D Rendering Engine
Supports Vulkan. You can achieve good quality as in Unity3d and Unreal Engine
Con Editor is Windows only
Since version 1.7, Linux can be targeted for runtime. The editor for the engine is available only to Windows though.
Con Small user community
Unity and UE have a vast amount of user community.
Con Install & build very dependent on specific versions of MSBuild
Install and project building are very dependent on specific and exacting versions of MSBuild.
The problem, of course, is that MSFT update Visual Studio quite a bit and even slight version number differences (for example installing now versus a week ago) seem to cause install and/or project build issues.
Con Shader system require's overhaul,
Shader's are not easy to get to grip's with and Stride's shader system need's overhauling for easyer use