Free: For screensavers, www.jwz.org/xscreensaver/download.html (scroll down to the bottom and choose "Mac OS X binaries"). For office applications (word processing, presentation, spreadsheet, database) use NeoOffice (at http://www.neooffice.org/neojava/en/maindownload.php); it's mush smaller than OpenOffice, and is more efficient. If you only need a free word processor, try AbiWord (http://www.abisource.com/download/ -- click "Mac OSX binaries") or FocusWriter (http://gottcode.org/focuswriter/). For image editing, use Seashore. For image conversion, use Dragoman (http://www.apple.com/downloads/macosx/system_disk_utilities/dragoman.html). For music, use iTunes (nothing beats it). For torrent downloads, use Vuze (formerly Azureus). For video editing, use Simple Video Splicer. For DVD extraction, use HandBrake at handbrake.fr. For anti-virus, use MacScan at macscan.securemac.com/
(in fact, 85 percent of Mac users have no anti-virus software, since Macs almost never get any virus). For Web page editing, use KompOzer. For unzipping, use Zipeg at www.zipeg.com. For browsing, use Safari or Firefox. For downloading embedded audio or video, use Video DownloadHelper extension in Firefox. For extensive system enhancements such as maintenance on a schedule or changing the Finder and screenshot preferences, use OnyX (http://www.titanium.free.fr/index_us.html).
Cheap but great: iLife comes free with new Macs. Even if you have an older Mac, iLife offers a lot of bang for your buck, or rather, for your 80 bucks. iWork is quite good for office applications (word processing, presentation, spreadsheet). Files can be exported as Microsoft compatibles (.doc, .ppt).
Browse for others here:
www.apple.com/downloads/
www.macupdate.com/
mac-free.com/
www.pure-mac.com/ (scroll to bottom and observe the "Denotes" icons)
www.freemacware.com/
downloads.zdnet.com/ (scroll down to the Mac section)
*************************