SoftPerfect Network Scanner is a free multi-threaded IP, NetBIOS and SNMP scanner with a modern interface and several advanced features. It is intended for both system administrators and general users interested in computer security. The program pings computers, scans for listening TCP ports and displays which types of resources are shared on the network (including system and hidden).
Gpg4win is a installer package for Windows (2000/XP/2003/Vista) with computer programs and handbooks for EMail and file encryption. Both relevant cryptography standards are supported, OpenPGP and S/MIME (the latter is in progress and currently works with GnuPG2 and Claws Mail). Gpg4win and the software included with Gpg4win are Free Software.