1)   Compare It! 4.0
Powerful file compare and merge utility. Features: built-in editor with syntax highlighting, undo and wordwrap; highlights changes within lines; editing or fast by-difference merging; printing; html and text reports; zip support; Unicode support.
file compare, file merge, compare, comparison, merge.,

 2)   File Append and Split Tool 1.0.0
Split and append files of all types and sizes; up to 16 million terabytes. Splits large files so they can be copied onto CDs, DVDs, etc. or sent via email. Choose output file size, media, or number of pieces. A simple concept executed to perfection.
file splitter, file splitting, file split, file append, file join, file chunk, file chunker, file merge, file slice, disk spanning,