UnityPDF - UnityPDF lets you merge, split, divide, rotate, protect PDF files and more.
JPEG to PDF - JPEG to PDF is a free program that can convert image files to PDFs.
PDFsam - PDFsam Basic, a free, open source, multi-platform software designed to split, merge, extract pages, mix and rotate PDF files
JPG to PDF Converter - Free online conversion of images to PDF files.
Clipperly - Convert, edit or optimize your files online. More than 400 different formats supported among documents, images, spreadsheets, ebooks, archives, presentations, audios and videos.
Convert-JPG-to-PDF.net - Convert JPG to PDF for free with this online service.