Icecream Apps. - ( Freeware)
IceCream PDF Split & Merge is a handy office tool for easily splitting and merging PDF files.
IceCream PDF Split & Merge is a simple and useful application that was designed to be very helpful when you need to split or merge PDF documents, whether or not protected. The four split mode offered by the application - into single-page files, by groups of pages, deletion of certain pages, by page ranges – allows you to do anything you need when it comes to splitting PDF documents. It also includes the option to display the documents. The Merge feature allows you to attach an unlimited number of PDF files and organize them according to your needs.
HiDPI support added.