PDFTron PDF CosEdit is described as 'PDF CosEdit is a stand-alone, low-level PDF editor. It is an essential power tool for professionals working with PDF, FDF, and PJTF. Manual editing of PDF files can be extremely difficult or impossible' and is an app in the Office & Productivity category. There are three alternatives to PDFTron PDF CosEdit for a variety of platforms, including Windows, Linux, BSD, iPad and iPhone. The best alternative is PoDoFoBrowser, which is both free and Open Source. Other great apps like PDFTron PDF CosEdit are PDF Vole (Free, Open Source) and RadaeePDF Classic SDK (Paid).
PDF Vole is a small tool to debug and analyze PDF files. You can open a PDF file and analyze its internal structure and content. I started this project to build a tool as I had to debug and analyze PDF files that did not render correctly or were broken in some way.
This is the well-known SDK for Android, iOS and Windows UWP. The SDK is based on the fast, reliable and numerous core library features completely written in C++. It supports Java, Objective-C, C#, Swift and Cordova languages.