Welcome on 
This portal talk about security softwares. Technical words can be used but explained.
VPN
- vpnc - Cisco-compatible VPN client
- strongswan - IPSec utilities for strongSwan
- openvpn - virtual private network daemon
- openswan - IPSEC utilities for Openswan
PKI/Certificates
- pyca - Certification Authority written in python
- openssl - Secure Socket Layer (SSL) binary and related cryptographic tools
- ca-certificates - Common CA certificates