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Work with faxes
1) HylaFax.
2) Fax2Send.
3) Efax.
4) VSI-FAX.

Dialup
1) Kppp.
2) X-isp.
3) wvdial.
4) Gppp.
5) Kinternet.
6) Rp3.
7) pppconfig + pon + poff.
8) Modem Lights.
9) Netcount.

FTN editor
1) Golded.
2) Golded+.
3) Msged.
4) Qded.

FTN tosser
1) hpt.
2) CrashEcho.
3) Qecho.
4) CrashMail II.
5) Fidogate
6) ifmail

FTN mailer
1) ifcico.
2) qico.
3) Bforce.
4) Binkd.

Remote management
1) VNC, Virtual Network Computing.
2) ssh.
3) Remote management is built-in in XFree86.
4) Remote management is built-in in KDE 3.1.
5) Rdesktop Client.
6) rsh / rlogin.
7) telnet.
8) Gtelnet.
9) x0rfbserver.
10) KDE Universal Remote Desktop.

Transmission of the files on modem
1) Minicom + lrzcz + Kermit.
2) Msterm.
3) Xtel.
4) uucp.
5) lrzsz + cu from uucp.

Work with ssh
1) Kssh.
2) ssh / openssh.
3) GTelnet.

Network monitoring tool
1) Gkrellm.
2) Big Brother.
3) Etherape.
4) Nagios.
5) Tkined.
6) MRTG.
7) Rrdtool.
8) PIKT.
9) Autostatus.
10) bcnu.
11) mon.
12) Sysmon.
13) Spong.
14) SNIPS.
15) iptraf
16) Ksysguard.
17) OpenNMS.
18) tcpdump.

Network maintance tool
1) HP OpenView agents.
2) Big Brother.
3) Cheops.
4) Tkined.
5) OpenNMS.

Protocols analysing, sniffing
1) Ethereal.
2) Tcpdump.
3) Etherape.
4) Ntop.
5) ipxdump. (+ipxparse for parsing)
6) Snort.

Security scanner
1) Nessus.
2) Nmap

Routing
1) iproute2 + iptables.
2) GateD. [Prop]
3) GNU Zebra.

Utilites and libraries for Ethernet/IP testing
1) lcrzo

IP-telephony (VoIP)
1) GNU Bayonne.
2) Openh323.
3) OpenPhone.
4) tkPhone.
5) NauPhone.
6) Twinkle
7) Ekiga (formely known as GnomeMeeting)
8) Gizmo
9) Kphone
11) Linphone
12) Skype

Sharing data / files
1) NFS.
2) Samba.
3) Samba-TNG.
4) FTP.

Viewing Windows-network
1) Samba.
2) KDE Lan Browser, lisa
3) LinNeighborhood.
4) xSMBrowser.
5) Komba2.
6) Konqueror.

ADSL
1) rp-pppoe.
2) Pptp client.

Distributed computing
1) Distributed.net.
2) Seti @ Home.
3) Folding @ Home.
4) Genome @ Home.
5) D2ol.

IPSEC protocol
1) FreeSWAN.

VRML viewer and editor
1) White Dune.

Work with Ebay
1) Bidwatcher.