Indexmeister reads a variety of formats (.tex, .docx, .epub, and others) and suggests keywords for indexing. The included program Imbrowse provides a semi-automatic interface to rapidly add index tags to multi-file latex documents.
pyPdf-GUI is a Python-based graphical user interface for the pure-Python PDF library pyPdf, allowing the user to easily manipulate PDF files. It can extract pages, merge several files into a single one, rotate pages in a file, extract text, etc.