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Task scheduler
cron, at (standard, console). GUI: Kcron.

Outlook scheduler
1) KOrganizer.

Virtual CD
1) Virtual CD Kernel Modul.
2) "cp /dev/cdrom mycd.iso" + "mount -o loop mycd.iso /mnt/cdrom/".

Text recognition (OCR)
1) ClaraOcr.
2) Gocr.
3) Kooka.
4) OCRopus.

Eng-rus dictionaries (cyrillic)
1) Mueller.
2) Ksocrat.
3) JaLingvo.
4) phpMyLingvo.
5) dict+Kdict.
6) DictX.
7) Groan.
8) Mova.
9) Slowo.
10) Stardict.

Work with scanner
1) Xsane.
2) Kooka.
3) Xvscan.
4) VueScan.

Antivirus
1) Dr. Web.
2) Trend ServerProtect.
3) RAV Antivirus. (Bought by Microsoft?)
4) OpenAntivirus + AMaViS / VirusHammer.
5) F-Prot.
6) Sophie / Trophie.
7) Clam Antivirus.
8) Kaspersky.
9) YAVR.

System configuration
1) setup (Red Hat).
2) chkconfig (Red Hat).
3) redhat-config-<feature>. (Red Hat 8.0).
4) xf86config, xf86cfg.
5) Linuxconf.
6) Drakeconf.
7) Webmin.
8) yast and yast2 (SuSE).
9) sysinstall (FreeBSD).
10) /dev/hands .

Boot managers
1) Grub.
2) Lilo.
3) ASPLoader.
4) Acronis OS Selector
5) Ranish Partition Manager.
6) osbs.
7) Symon.
8) Smart Boot Manager.
9) Xosl.
10) GAG.

Hard disk partitions manager
1) PartGUI. (GUI for partimage and parted)
2) GNU Parted. (GUI - QTParted).
3) Partition Image.
4) fips.
5) Diskdrake (Mandrake).
6) Paragon Partition Manager
7) Acronis PartitionExpert. (review)

LVM + soft-RAID + parted + ...
1) EVMS.

Backup software
1) Legato Networker
2) Lonetar.
3) Disk Archive.
4) Bacula.
5) Taper.
6) dump / restore. (console, standard)
7) Amanda (console).
8) Mondo Rescue. (backups that boot and auto restore themselves to disk)

Making images of disk partitions
1) PartitionImage (GUI - PartGUI).
2) dd (console, standard).
3) Mondo Rescue.

Machine mirroring over network
1) UDP Cast.
2) Techteam's UDP Cast Disks.
3) Ghost for Unix (g4u).

Task manager
1) top (console, standard).
2) Gtop, Ktop.
3) Ksysguard.
4) "ps aux|more", "kill <pid>"

Automatic switch between English and Russian when you type
1) Kgesture.
2) wayV.
3) Optimoz.

TV program
1) Home Portal

Text to speech
1) KDE Voice Plugins.
2) Festival.
3) Emacspeak.
4) VoiceText.

PIM / DB / hierarchical notebook with tree view
1) TreePad Lite. [Prop]
2) Yank.
3) TreeLine.
4) Gjots.
5) Leo.
6) Hnb - hierarchical notebook.
7) TuxCards.

Program for quick switching between resolutions and frequencies
1) Multires.
2) Ctrl+Alt+"-", Ctrl+Alt+"+".
3) Fbset. (when using framebuffer)

Search and replace text in files
1) find (console, standard).
2) slocate (console, standard).
GUI:
1) Gsearchtool.
2) Kfind.
3) Any file manager

Local search engine with SGBD for indexing
1) mnoGoSearch.
2) ASPSeek.

System monitoring
1) top (console, standard).
2) Gkrellm.
3) Ksysguard.
4) Survivor.
5) htop

Program for logs viewing
1) Xlogmaster.
2) Analog.
3) Fwlogview. (firewall)

Data Recovery Tools
1) e2undel.
2) myrescue.
3) TestDisk.
4) unrm.
5) Channel 16.

Text files encoder with automatic detection of character set
1) Enca.
2) Jconv.
3) Xcode. (cyrillic)
4) Asrecod. (cyrillic)

Alarm clock
1) KAlarm.

Work with Palm
1) Kpilot.
2) Jpilot.

Allows to carry on Palm .html files
1) iSilo.
2) Plucker.

Low-level optimization (chipset, pci-bus)
1) Powertweak-Linux.

Bible
1) BibleTime (KDE)
2) Gnomesword (Gnome)