PDFsam Basic lets you split, merge, and extract pages, as well as rotate and mix PDF files. Input files can be merged completely or partially, and a page selection can be set in the form of comma-separated page intervals (eg. 1-10, 14, 25-), letting you specify what pages you want to merge.

Generated PDFs can include a table of contents at the start of the file. A list of clickable entries will let you easily navigate through the merged files.

Versions for Mac and Linux also available, as well as a commercial version with additional features.