getxbook is a collection of tools to download books from websites. There are tools to download from Google Books' "book preview", Amazon's "look inside the book", and Barnes and Noble's "book viewer". There is an optional GUI written in Tcl/Tk, and some shell scripts using OCR to create plain text or searchable PDFs and DjVu files from the downloaded books.
MuDownManager is a program for managing downloads from Megaupload and Rapidshare for premium members. It is lightweight and cross-platform. Downloads can be started in a batch by specifying a list of URLs. Links can be copied directly from your preferred Web browser and pasted into MuDownManager. MuDownManager lets you skip LinkBucks. It has a very simple and intuitive GUI. It is pluggable, allowing support for other download sites to be added in the future.