Linux Knowledge Base and Tutorial
Linux About
Sciaga UNIX Toolbox
Linux Command Line Reference More Linux Command
FOSSwire Unix/Linux Command Cheat Sheet
Bash Command Line History
sed cheat sheet
awk cheat sheet
VIM Reference Card
Graphical vi-vim Cheat Sheet
Emacs cheat sheet
Debian tlumaczenia
Fedora
OpenSUSE
Linux-Unix cheat sheets - The ultimate collection
A crontab GUI to make crontab format and syntax easy
RegEx Evaluator
AlternativeTo
open source alternative
wakoopa - discover software & games
Linux Apps Finder - Windows and OS X Software Alternatives
The Password Meter
Narzędzie do sprawdzania haseł Microsoftu
GoodPassword
Javascript Password Strength Meter