megamerger takes two overlapping sequences and merges them into one sequence. It could thus be regarded as the opposite of what splitter does.
Here is a sample session with megamerger. There are many mismatches between these two sequences and the merged sequence should therefore be treated with great caution:
% megamerger embl:ap000504 embl:af129756 Merge two large overlapping nucleic acid sequences Word size : Output sequence [ap000504.merged]: Output file [ap000504.megamerger]: