The lxml XML toolkit for Python
Lexbor is development of an open source HTML Renderer library
PDFCraft is a free, privacy-focused PDF toolkit
A simple tool for reading in poorly redacted documents
Repair invalid JSON documents
Fast JSON parser and validator for Go
XML editor
XMLJ is a Java XML Editor and validator project.
RFC 3986 URI parsing and processing libary
Development toolkit for Web Services and XML data bindings for C & C++
csv2odf can convert csv data to formatted spreadsheets and documents.
ETL engine based on Groovy
Change encoding of text files.
XML text markup for ancient documents
An editor for structured documents
Simple C++ XML processing
eXist-db is a feature rich Open Source native XML database