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Ésta es una selección del mejor software gratuito recomendado por la revista PCWorld.

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7-Zip Create ZIP compressed archives for free with this handy utility.
Abilon This powerful, speedy RSS reader offers a choice of views, and features a built-in tabbed browser.
AbiWord This lightweight, full-featured word processor is compatible with Microsoft Word documents and also runs on Linux and Macs.
AIM Mail AIM mail offers 2GB of storage and integration with AOL Instant Messenger.
AirDefense Personal Lite This simple program alerts you whenever you connect to an insecure network or to a hotspot you haven't previously marked as safe.
Alleycode A simple HTML editor for people who are comfortable with code and need to do some quick editing.
All-in-One Secretmaker All-in-One Secretmaker blocks banner ads and pop-ups, filters spam, and offers an array of utilities for cleaning up and securing your system.
Anonymizer This anonymous browsing service will display Web pages without revealing any information to the sites you visit.
Audacity All-purpose audio editor lets you record, play, and edit digital files.
Avast Home Edition This antivirus scanner can do a boot-time virus scan (which can catch more viruses than scanning once Windows is running) and will continually monitor your system for threats.
Avvenu This free remote-access and file-sharing service lets you and your colleagues get to files on an Avvenu-enabled computer from another computer, Web-enabled phone, or PDA.
Backpack Create Web pages--with to-do lists, notes, pictures, and more--that you can share with a group.
Bartleby This online reference library offers a host of features, including a dictionary, thesaurus, and various books of quotations.
BeInSync Make sure you have access to your critical files and folders with this remote-access tool.
BitTorrent BitTorrent is useful for downloading legitimate content quickly or for sharing your own files.
Blogger This blogging service remains incredibly simple to use, but offers a rich complement of features.
Bloglines This Web-based RSS reader lets you access your news from multiple PCs.
CCleaner Finds and zaps useless files--including cache files and old Registry entries--that may be slowing down your PC.
Celestia Zoom through the solar system with Celestia, which offers real-time views of planets, moons, comets, stars, and more.
Copernic Desktop Search Copernic lets you search local files as well as Outlook and Outlook Express e-mail.
Del.icio.us Forget bookmarks--this service keeps track of your favorite sites, and much more, from any Internet-connected PC.
eFax Messenger You can receive faxes on your PC with eFax, viewing or printing them via the eFax Messenger software.
EssentialPIM Free EssentialPIM combines a calendar, contact manager, to-do list, and notes manager in a single program.
Feedreader This free Windows utility displays your news feeds, and includes flexible keyboard shortcuts.
Festoon Beta This add-on for Skype and Google Talk lets users of these two services make calls to each other, and brings video chat capabilities to Google Talk.
Firefox Still using Internet Explorer? It's time you made the switch to Firefox--a more secure, faster, and more flexible Web browser.
FlashGot This Firefox plug-in simplifies downloading, allowing you to grab every page from a Web site or download multiple files efficiently.
Flickr Easily upload, share, and post pictures with this popular service.
FolderShare (Mac)
FolderShare (Windows) Automatically sync files and folders between multiple computers and easily share data with colleagues and friends.
FolderSync Keep your USB drive and your hard drive on the same page with this synchronization utility.
FoxIt Reader For viewing PDF files, FoxIt Reader beats Adobe Reader hands-down--and it's got some tools Adobe lacks.
Free Download Manager This companion to Internet Explorer can speed up single-file downloads, resume interrupted downloads, manage bandwidth usage, or schedule multiple file downloads for specific times.
FreeConference.com Set up and host conference calls with this free Web service.
FreeMind FreeMind allows you to compile your notes in a "mind map"--a free-form tree structure that mimics the way your brain works.
Furl Save your favorite Web pages in an online account that you can access from any computer.
GetByMail Don't pay for a pricey remote-access app--GetByMail offers access to your office computer through your e-mail account.
Gmail Google's e-mail service feels more like a Windows application than a Web mail service.
Google Desktop Google Desktop extends the power of the Web's most popular search engine to your desktop by indexing nearly every document on your hard drive.
Google Earth Spin the earth, tilt it, and zoom in to objects as tiny as one building.
Google Picasa Picasa offers a simple--and free--way to organize, touch up, and share your photos.
Google Video Google's service is well suited for commercially oriented video producers looking for a large audience for their work.
GRC Shields Up This browser-based tool checks your PC for common vulnerabilities, such as open ports.
Groove Virtual Office Bring your far-flung coworkers together with this file-sharing and collaboration tool.
Hyperwords This Firefox browser plug-in makes any text on any Web page clickable.
Irfanview This lean, mean graphics utility offers basic image editing and file format conversions.
iTeamwork This Web-based project management service helps groups keep track of complicated projects.
iTunes Apple's media player is a joy to use even if you never buy a 99-cent song.
Kodak EasyShare Gallery This site's usability, mobile-phone access options, and lack of upload restrictions make it our top pick for photo sharing.
Kristal Audio Engine This sophisticated audio mixing and sequencing platform offers features found in much pricier apps.
Lavasoft Ad-Aware SE Personal Ad-Aware scans your PC for spyware, making sure that no digital snoops are lurking in memory or on your hard drive.
LiveJournal LiveJournal offers plenty of customizable options for your blog, and carries no advertising.
LogMeIn This remote access service lets you control your PC from afar, via a Web browser.
Microsoft Tweak UI Take control of hidden Windows XP settings, from determining what appears on your Start menu to specifying how users log on to your computer, with this extra set of tools created by Microsoft developers.
Microsoft Windows Defender (formerly AntiSpyware Beta) Microsoft's antispyware app catches spyware that other programs don't--including the dangerous "rootkit" Trojan horse that some Sony music CDs carry.
MSN Hotmail MSN Hotmail offers a respectable 250MB of storage and a familiar, Windows-like look.
MSN Search Toolbar With Windows Desktop Search This search tool indexes your hard drive and provides search results through a Windows application, rather than a browser.
MySpace MySpace lets you store an unlimited number of small images, and makes uploading music and images easy.
Netomat This social networking service allows you to create, access, and share content on the Web or a phone.
Netscape Webmail Netscape Webmail offers 250MB of storage and features large, easy-to-click buttons.
NewsGator NewsGator displays your RSS feeds in a clean, readable display.
Nvu This sophisticated Web page editor doesn't require any understanding of the underlying tags.
OmniFormat Convert BMPs to JPEGs, GIFs to PDFs, Word documents to TIF image files, and more with this free document conversion utility.
OpenOffice.org This full-fledged, Microsoft Office-compatible office suite offers a word processor, spreadsheet, presentation package, and database--and it doesn't cost one thin dime.
Palm Desktop This remarkably well-designed calendar and address book application will appeal to users who don't even have a PDA.
Pandora Enter the name of an artist or song that you like and Pandora creates a custom "radio station" for you--and makes surprisingly good choices.
PBwiki Create a free, password-protected wiki--a collaborative Web site--with PBwiki.
PDF Creator This printer driver lets you create Adobe Acrobat files from within almost any application.
Pegasus Mail A longtime favorite of power users, this e-mail client provides a huge amount of control over your mail, with support for mail merges and flexible filtering options.
podAmigo podAmigo works with the Podomatic Web service to organize and download your podcasts.
Project Gutenberg Browse electronic versions of more than 17,000 books at this online library.
Putfile This basic video sharing service works reliably and well.
PuTTY This free utility allows you to create an SSH, Telnet, or Rlogin connection.
QNext This universal instant messenger service includes robust music-sharing%252520and photo-sharing features.
Revver This service--our Best Bet--is a video sharing site from which you can actually make money.
RssReader RssReader displays your news feeds simply and cleanly.
SeaMonkey This suite of Internet tools includes the Mozilla browser, an enhanced version of the netscape Messenger e-mail client, the ChatZilla IRC chat program, and an HTML editor.
SightSpeed This video calling service is simple to set up, synchronizes lip movements and audio neatly, and offers easy in-call controls.
Skype Skype offers free PC-to-PC voice calls with text chat and file transfer capabilities.
Spybot Search & Destroy Spybot is a powerful antidote in the battle against spyware.
Steganos LockNote Password-protect text files with LockNote, a simple notepad with strong encryption.
Streamload Mediamax Streamload Mediamax is great for users who want to share lots of big files in addition to videos.
SyncNotes This sticky-note application runs on your computer, but allows you to view and edit your notes from any Web or WAP browser.
System Information for Windows This utility will tell you everything you need to know about your computer's hardware, operating system, installed programs, and more.
Ta-Da List Stay organized with this straightforward to-do list manager.
The GIMP (GNU Image Manipulation Program) This freely distributed app includes tools for photo retouching, image composition, and image authoring.
ThinkFree Online Beta This software runs in your browser and lets you edit Microsoft Office-compatible documents, spreadsheets, and presentations.
Thunderbird The tighter security and robust stability of this e-mail client make it the top choice for managing e-mail on your PC.
Trend Micro HouseCall This Web site runs software in your browser to scan for and eliminate malware on your PC.
Trillian Basic This universal IM client lets you keep in contact with your friends whether they use IRC, AOL, ICQ, MSN Messenger, or Yahoo Messenger.
Vimeo Of the video sharing services we tested, Vimeo is perhaps the easiest to use.
Wapedia For accessing Wikipedia from a PDA or smart phone, try Wapedia.
Wikipedia This online encyclopedia is a convenient way to find general information on almost anything.
Windows Live Mail This Ajax-based service is still in beta, but you can put your name on a waiting list.
WordPress.com This hosted blogging service offers a clean, fast interface.
WordWeb This handy utility provides a dictionary and a thesaurus that work in any application on your computer.
WriteBoard This service lets you create, edit, and share documents with others right in your browser.
Xanga Classic Xanga offers 200MB of image storage and features plenty of blog-formatting templates.
Yahoo Briefcase Yahoo Briefcase is one of the easiest ways we know of to store and share files online.
Yahoo Calendar This ad-supported calendar is one of the best available online.
Yahoo Mail With a traditional, forms-based Web interface, Yahoo mail is quick and easy to use.
Yahoo Mail Beta Beta, not yet public.
Yahoo Widgets This application puts "widgets" on your desktop that provide useful information, such as news updates, weather reports, stock tickers, or photos, or provide handy little services, like performing search engine queries, storing your notes, and more.
ZoneAlarm Zone Alarm's free firewall keeps watch over inbound and outbound Internet connections, helping avert malicious attacks by hackers and spyware.