1. WinScp
The best sftp and secure shell SSH2 client- for Windows-open source. Using public key-private key system it helps greatly in HIPAA compliance
2. Open Suse 11
Easily the best operating system ever, virus free, open source and very comprehensive and easy to use.
3. Oracle XE
Easily one of the best database systems ever,rock solid, virus free and comprehensive.Ofcourse we have not tried Ingres and Sybase. Soon we would.
4. Axcrypt
Easily the best encryption system ever, for Windows, very easy to use, helping compliance with HIPAA and is open source
5.VPNs Linux VPN servers-ipsec/poptop/sslvpn for Windows & Linux clients, very easy to use and open source