Wicked PDF - PDF generator (from HTML) plugin for Ruby on Rails
PDF Clown - PDF Clown is an open-source general-purpose library for manipulating PDF documents through multiple abstraction layers, rigorously adhering to PDF 1.7 Specification
SEOBOTS.io - Easy to use bots for data mining and growth hacking: parsers, crawlers and much more.
PdfPig - Read and extract text and other content from PDFs in C# (port of PDFBox)
TexAu - Growth automation to scale your business faster
Document .Net - Gives you API to do everything with a document in PDF, DOCX, DOC, RTF, HTML and Text formats.