A valuable forum for german speaking users- if someone knows a similar forum, please let us know.
This points you to sites with software and documenation team member uses to create their own keys.
A nice graphical interface, works for Windows as well as Linux.
TinyCA is a simple graphical userinterface written in Perl/Gtk to manage a small CA (Certification Authority). TinyCA works as a frontend for openssl
Creating Self-Signed Certificate Authority Certificate
For those who run the most important servers without X11