BITS -- Background Intelligent Transfer Service
License: GNU General Public License (GPL)
BITS was primarily designed by Microsoft® for auto-updates (e.g. Windows® Update). The advantage of BITS is that it uses free bandwidth for the downloads. Your connection won't be slowed down if BITS is downloading files in the background.
BITS is a so-called "service" which is running in the background any time your system is running. Even if you close WinBITS, your BITS-downloads will still be processed.
With WinBITS, you can use BITS for you own purposes, e.g. downloading large files from the internet.