spam Report on IP address/ranges
Shell-fu is a place for all those little command line goodies that you come across and then can never find again when you need them
Sysdig is open source, system-level exploration: capture system state and activity from a running Linux instance, then save, filter and analyze. Think of it as strace + tcpdump + lsof + awesome sauce. With a little Lua cherry on top.
Massive scale installation and management tools for Debian GNU / Linux
A Middlebox Detection Tool
x2go ist eine umfassende "server based computing" Lösung auf NX-Basis