PdfEbookCutter is a very similar project to Briss (https://sourceforge.net/projects/briss/).
This program is rewritten in C# with more functionalities. It uses the the itextsharp (https://sourceforge.net/projects/itextsharp/) pdf engine for cropping operations and pdf outlining.
The main functions are:
if there are exceptions, or there just appears a red cross in the window, the pdf file can't be open with pdfebookcutter. if you want to give it try, you can open here a support ticket and upload the pdf file
Hint: Press the shift button while releasing the mouse button, and then the rectangle will thrink or expand so the marked text is in the rect
to change the order, press the control button, and click in the order you want to read the parts on the rectangles
to move a rectangle, or to resize it, you can edit it like in any other graphic program
if you are finished with marking the rects, you can save the file with file -> save
if you want to export all open files into one directory (e.g. directly on your ebook reader), you can give in the folder into the fast export box, and press on save.