Free UTM appliance: firewall, VPN, WAF and antivirus in one ISO.
Browse on Tor / i2p - Anon p2p Chat / FileTx, Conf / Video VoIP
Xplico is a Network Forensic Analysis Tool (NFAT)
Open Source PKI solutions
Simple and secure password management for Firefox users with KeePass
Logs IP to IP contact, number of packets, bytes.