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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.
SpecsUpdate
Pros
Pro Uses original .NET Core runtime
This means every .NET/C# library works natively with this engine.
Pro Projects are normal Visual Studio solutions
No proprietary project format, so it works with all the official .NET tooling.
Pro Good looking and fast
Looking nearly as good as Unreal Engine 4, but rendering significantly faster.
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 Powerful 3D Rendering Engine
Supports Vulkan. You can achieve good quality as in Unity3d and Unreal Engine.
Pro Supports Vulkan
Currently the only well known open-source game engine that supports Vulkan, and probably one of the only.
Cons
Con Community is still relatively small
The community is still relatively small. Tutorials are not as abundant as with other engines.
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 Iteration may be slower than with other engines due to longer "build" times when certain changes are made
Recommendations
Comments
Flagged Pros + Cons
Con Advertises itself as open source but is not
Xenko claim their engine is open source, but source code is only available to the upper subscription tiers (pro plus and custom) and may not be shared with anybody not in the same tier.
Out of Date Pros + Cons
Con Requires Xamarin for mobile development. Note: No longer needed
Xamarin is also free, though.
Con Beta is only free
Only the beta is free. The full version, in the later part of 2017, will not be.
