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 Very modern render engine
Pro Straightforward editor
Stride provides a simple and clean working environment for designing games.
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 Easy to learn and use C#
Pro Community seems friendly and is growing
Pro Supports Vulkan
Currently the only well known open-source game engine that supports Vulkan, and probably one of the only.
Pro Powerful 3D Rendering Engine
Supports Vulkan. You can achieve good quality as in Unity3d and Unreal Engine
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 Multiple Starter Templates
The engine comes packed with multiole example projects to help you get started.
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 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 Does not currentyl support Playstation or Switch games
Con Iteration may be slower than with other engines due to longer "build" times when certain changes are made
Con Small user community
Unity and UE have a vast amount of user community.
Con Shader system require's overhaul
Shader's are not easy to get to grips with and Stride's shader system. Needs overhauling for easier use.