qpdf / qpdf

qpdf: A content-preserving PDF document transformer

wmjordan / PDFPatcher

PDF补丁丁——PDF工具箱，可以编辑书签、剪裁旋转页面、解除限制、提取或合并文档，探查文档结构，提取图片、转成图片等等

UglyToad / PdfPig

Read and extract text and other content from PDFs in C# (port of PDFBox)

unidoc / unipdf

Golang PDF library for creating and processing PDF files (pure go)

chinapandaman / PyPDFForm

🔥 The Python library & CLI for PDF forms.

ExtractPDF4J / ExtractPDF4J

Java PDF table extraction & OCR library. Extract structured tables from text-based and scanned PDFs using stream, lattice (OpenCV-style grid detection), and hybrid parsing.