Interop
REST API https://www.convertapi.com/prices
API
aspose 999€ https://purchase.aspose.com/pricing/slides/net/ https://releases.aspose.com/slides/net/ https://www.nuget.org/packages/Aspose.Slides.NET/
spire 799€ https://www.e-iceblue.com/Buy/Spire.Presentation.html
