WatchGuard XTM - Discontinued Product - WatchGuard Technologies is strongly committed to providing industry-leading products and services.
DeliverySlip - DeliverySlip helps simplify, secure, and expedite the burdensome elements of online collaboration...
pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more
GPGTools - Use GPG Suite to encrypt, decrypt, sign and verify files or messages.
ClearOS - A very good alternative for Windows Server, for free
Toolsley PGPigeon - Simple but powerful OpenPGP-compatible message encryption webapp.