| Sicher im Netz | Beratungsportal für Online-Sicherheit |
| OpenSSH | Encrypts all traffic (and passwords) to eliminate eavesdropping, connection hijacking and other network-level attacks. |
| Squid-Cache | free, open-source full-featured Web proxy cache |
| Asterisk | A complete PBX in software for Linux, BSD and MacOSX. Does VoIP in many protocols, and almost all standards.
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| Skype | Program to phone for free via the internet. |
| Go to meeting | Webconference service which allows webconferences with sharing of the actual screencontents. |
| Stunnel | Free program to encrypt arbitrary TCP connections inside SSL (Secure Sockets Layer) available on both Unix and Windows |
| Wengo meeting | Service to set up free live audio and video conferences |
| Jabber | Open, ad-free consumer Instant Messaging Service |
| MeBeam | Service to set up free live audio and video conferences |
| Cexx | Website with tipps and tools against spam and spyware. |
| LogMeIn | Connects two or more computers via Internet into their own virtual network for direct secure communication. Free. |
| WinSCP | Download of a free free SFTP, FTP and SCP client for Windows |
| lighttpd | High performance open source webserver |
| RSS Owl | News feed reader |
| PuTTY | Download of a free Telnet and SSH Client software |
| ICQ | Instant messenger with 150 million registered users. |
| BugMeNot | Created as a mechanism to quickly bypass the login of web sites that require compulsory registration |
| Pidgin | Multi-protocol Instant Messaging client that allows using of many IM accounts |
| Spreed | Organisiert Online Konferenzen, Meetings und Trainings mit mehreren Teilnehmern über den Webbrowser. |
