Customisable, Multi-Display Resizer
SuperSize is a utility which maximises your window to multiple displays for maximum work (or play) efficiency. It includes a number of presets to maximise to and it's extensible with plugins for ultimate adaptability.
SuperSize can be downloaded from GitHub Releases.
This is a fairly standard .NET application, clone it and open the solution with Visual Studio or Rider, restore NuGet packages and click Run. You will need the .NET 8.0 SDK or newer.
Developer documentation is kept in the wiki. The project roadmap is available here.