ChunkJoiner is described as 'lets you join (physically concatenate) a group of documents into a single piece. To use it, simply select the documents you want to join, and drag&drop the entire group on top of the ChunkJoiner icon' and is an app in the File Management category. There are more than 10 alternatives to ChunkJoiner for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and BSD. The best alternative is FFSJ, which is free. Other great apps like ChunkJoiner are GSplit (Free), Batch File Split & Join (Paid), SplitFile (Free) and Free File Splitter (Free).
GSplit is a free file splitter that splits any file (like Self-Extracting archives, Zip archives, disk images, multimedia, music, video, backup, image, archive, log, large text, document files...) into smaller files called pieces.
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.