ComPDFKit
ComPDFKit enable developers to integrate PDF Annotations and Format Conversion, Digital Signature, Smart Forms, OCR, Redaction, and more in to their applications on Windows, macOS, iOS, Android, and the web through their PDF SDKs. Their aim is to offer the most comprehensive library to shorten the project development cycle and to continuously improve their SDK products to meet developer's future requirements as they change and projects evolve.
AutoDWG
Founded in 2002, AutoDWG is an innovative software company providing high-efficient and user-friendly CAD software around the world. They use innovative technologies to improve their software, helping you to read, write, encrypt, share and convert between files of PDF, DWG, DXF, DWF, SWF and GIF formats.