JS TExt File Merger would be very useful tool for those who wish to merge text files.
Beyond just merging, one can set the sequence of the files to be merged. By default the files
with extensions "TXT", "DAT" and "SQL" are considered for merging. But the users can
specify any text file type in the options.
This tool will be very helpful in SQL scripting where you need to run many SQL scripts
one by one in specific sequence etc. The use of this is not limited to this. One may merge
any text files/data files.

Above all it is a high quality freeware for any use.