sniffglue
Network & VPN
Secure multithreaded packet sniffer
sniffnet
Network & VPN
Cross-platform application to monitor your network traffic
snitch
Network & VPN
Prettier way to inspect network connections
snort
Network & VPN
Flexible Network Intrusion Detection System
snowflake
Network & VPN
Pluggable Transport using WebRTC, inspired by Flashproxy
snx-rs
Network & VPN
Open-source client for Check Point VPN tunnels
speedbump
Network & VPN
TCP proxy for simulating variable, yet predictable network latency
sproxy
Network & VPN
HTTP proxy server collecting URLs in a 'siege-friendly' manner
sqtop
Network & VPN
Display information about active connections for a Squid proxy
squid
Network & VPN
Advanced proxy caching server for HTTP, HTTPS, FTP, and Gopher
sshuttle
Network & VPN
Proxy server that works as a poor man's VPN
ssldump
Network & VPN
SSLv3/TLS network protocol analyzer