Top 2 acroform open source projects

pdfHTML is an iText 7 add-on for C# (.NET) that allows you to easily convert HTML and CSS into standards compliant PDFs that are accessible, searchable and usable for indexing.

BulkPDF is a free and easy to use open source software, which allows to automatically fill an existing PDF form with differen values. Only a spreadsheet (Microsoft Excel 2007/2010/2013, LibreOffice or OpenOffice Calc) with the desired values is required.