Release Notes: Man and documentation page updates, removal of the default call to shutdown() (it can be enabled via an option), ability to dynamically adjust the number of started threads, and better handling of system limits on the number of threads.
Release Notes: This release adds support for reading hosts/ports from stdin. There were Linux portability fixes, and command line options are now better structured. You can now search for substrings inside lines.
Release Notes: This release adds CIDR and port-ranges support.
Release Notes: The command line options handling was revamped. The ability to scan Web servers was added.