Fetches URLs to stdout. Useful to fetch files without having to launch a browser. Some non-web protocols e.g. FTP may also work. [Open Source]

Copies one or more whole web-directories to disk. [Open Source]

Non-graphical, non-interactive tool for batch downloading of files. Highly configurable. Supports resuming interrupted downloads over HTTP and FTP. [Open Source, GPL]

Verifies that files have been copied correctly using a CRC checksum. [Freeware]

a simple program to download complete websites to your local computer. [Open Source]

Highly configurable web grabber with Smart Cache support. [Freeware]

File tree synchronization and cross-validation. Allows validation of backups and working on different machines, without needing to worry about manually copying every file over every time. [Open Source, GPL]