100 of the Best (Useful) OpenSource Applications | Ubuntu Lin...

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Beagle:
(http://beagle-project.org/Main_Page)

Beagle is a search tool that ransacks your personal information space to find whatever you’re looking for.

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ClamAV:
(http://www.clamav.net/)

Clam AntiVirus is an open source (GPL) anti-virus toolkit for UNIX, designed especially for e-mail scanning on mail gateways.

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FileZilla:
(http://filezilla-project.org/)

FileZilla is a fast FTP and SFTP client.

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OpenOffice:
(http://www.openoffice.org/)

OpenOffice.org the product is a multi-platform office productivity suite. It includes the key desktop applications, such as a word processor, spreadsheet, presentation manager, and drawing program, with a user interface and feature set similar to other office suites. Sophisticated and flexible, OpenOffice.org also works transparently with a variety of file formats, including those of Microsoft Office, and the vendor-neutral OpenDocument standard from OASIS.

Available in over 65 supported languages with more being constantly added by the community, OpenOffice.org runs stably and natively on Solaris, Linux (including PPC Linux), Windows, Mac OS X (X11), and numerous other platforms. Our porting page lists the platforms (ports) that OpenOffice.org can run on.

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Pidgin:
(http://www.pidgin.im/)

Pidgin is a multi-protocol Instant Messaging client that allows you to use all of your IM accounts at once. Pidgin can work with:

AIM

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TrueCrypt:
(http://www.truecrypt.org/)

Free open-source disk encryption software for Windows Vista/XP, Mac OS X, and Linux.

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VNC:
(http://www.cl.cam.ac.uk/research/dtg/attarchive/vnc/index.html)

VNC stands for Virtual Network Computing. It is, in essence, a remote display system which allows you to view a computing ‘desktop’ environment not only on the machine where it is running, but from anywhere on the Internet and from a wide variety of machine architectures.

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qOrganizer:
(http://qorganizer.sourceforge.net/)

qOrganizer is a general organizer that includes a calendar with schedule,reminders,journal/notes for every day, to-do list.
But provides features useful for students such as:timetable and a booklet for marks and absences.It’s designed to be easy to use.
It represents a new approach to an organizer, with several innovative features.

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Specto:
(http://specto.sourceforge.net/)

Specto is a desktop application that will watch configurable events (such as website updates, emails, file and folder changes, system processes, etc) and then trigger notifications.

For example, Specto can watch a website for updates (or a syndication feed, or an image, etc), and notify you when there is activity (otherwise, Specto will just stay out of the way). This changes the way you work, because you can be informed of events instead of having to look out for them.

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Sunbird:
(http://www.mozilla.org/projects/calendar/sunbird/)

Mozilla Sunbird is a cross-platform calendar application, built upon Mozilla Toolkit. It provides you with a full-featured and easy to use calendar application that you can use around the world.

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