Lay.Ly 

Professional Excel exporter library using ClosedXML with attribute and multi-sheet support.

Sandboxed file-manager building blocks for ASP.NET Core: pluggable storage abstraction, path/traversal security, chunked uploads, image thumbnails, Office-document/email-to-PDF conversion, and a drop-in MVC... More information

Core PDF creation, reading, drawing, page manipulation, annotations, images, tables, and forms APIs.