SumatraPDF is an open-source, collaborative project. We always welcome new developers who want to join the project, contribute code and new features.
You'll need Visual Studio 2019. A free Community edition will work.
Get the sources from https://github.com/sumatrapdfreader/sumatrapdf
vs2019/SumatraPDF.sln compile and run.
Read more about our build system.
We use a standard GitHub model:
Before you start working on a significant addition, it's a good idea to first discuss it in issue tracker.
You can use issue tracker for development related topics or forums for general topics.