Split And Merge PDF Files

There is various situation where manipulating PDF files
can be needed.
PDF-Shuffler is a little but powerful tool allowing to merge or split PDF files.
Merging can be interesting to create an unique document from several ones.
Splitting/Cropping can be interesting to split PDF A2 to multiple A4 documents.

This latter can be easily done in two steps:

• open the PDF files, crop 50% of the right part, save
• open the PDF files, crop 50% of the left part, save

More information can be found here, and here.