Combine

PDF Combine Pro is a life saver for those who need to combine PDF, DOC, TXT, DOCX, HTML, XLS files, images (TIFF, JPEG, PNG) and emails into one PDF.

FOSS messaging and emailing app that combines common web applications into one

Split and merge multiple text or binary files in either character, line, or byte modes. When splitting files, you can split on certain text or binary separator; target given number of parts; or target specific part size. Join files on lines/bytes.