OWASP Coraza WAF is a golang modsecurity compatible firewall library
Scalable PaaS (automated Docker+nginx), aka Heroku on Steroids
Open source cross-platform Java Visual Traceroute
IP Address Management - CMDB - Ticketing - DNS and Zone Management
AS2 1.1 server implementation in Java
Pure Java FTP server. Free portable cross-platform multi-threaded.
Pure Java TFTP server.
Java SSH API
Multi-protocol server written in Java