Most, if not all of these programs have demo versions you can download and try out before buying.
Graphics Shareware
Intaglio-
Mac $89.99Vector Drawing, alternative to Illustrator, Freehand, etc.
Drawit-
Mac $42.00Vector Drawing, alternative to Illustrator, Freehand, etc.
Video Shareware
VisualHub-
Mac $23.32A very easy to use video conversion program. It has batch conversion, can use Xgrid, and even shut down your computer when finished.
ffmpegX-
Mac $15.00Almost a Photoshop of video converting. It can do almost everything, but because of that, it can be complicated to figure out.
Website Creation Shareware
Coda-
Mac $79.00A text-based website editor, a css editor, and ftp all in one program.
Transmit-
Mac $29.95Ftp.
CSSEdit-
Mac $29.95CSS Editor.
System Enhancement Shareware
Default Folder-
Mac $34.95Improves the open and save windows to give you favorites, list recently opened folders, allows you to jump to open folders, rename files, etc.
Utility Shareware
TechTool-
Mac $99.99THE Mac repair program. It can defrag, repair, and even test hardware like RAM.
Freeware Software Links
I (Lightfoot) have a Mac, so it's very likely this list will include more Mac programs than those for Windows.
I tried to include mostly programs I've used before to at least some degree, but many of these programs I use myself.
Graphics Freeware
Gimp-
Mac+
WinAn open-source alternative to Photoshop, etc.
The Mac version requires X11 to be installed.
Gimpshop-
Mac+
WinA verison of Gimp that has an interface closer to Photoshop.
The Mac version requires X11 to be installed.
Scribus-
Mac+
WinAn open-source alternative to Indesign, Quark, Pagemaker, etc.
Inkscape-
Mac+
WinAn open-source alternative to Illustrator, Freehand, etc.
The Mac version requires X11 to be installed.
Drawit Lite-
MacThe free, slightly feature limited version of Drawit, a vector drawing program.
Seashore-
MacA light-weight fully Mac image editor based on Gimp. It's early in development, but it's very impressive so far.
Pixia-
WinA popular painting program. I'm not sure if it's more of a replacement for Photoshop, or for Painter.
Imagewell-
Mac"Quickly resize, crop, watermark, edit your images and then upload them to the web." Batch editing requires updating to the shareware version.
Xee-
MacAn image viewer with some features not found in Apple's Preview. It can flip through all of the pictures in a folder. It can copy and move images, as well as turn or flip them.
DropJPG-
Mac"DropJPG makes it easy to convert images from most formats to JPEG. Just drag an image or a folder of images onto its icon and they will be converted."
Thumbscrew-
MacDrag & drop batch thumbnail creation. It can even rotate or add borders.
I use this for the thumbnails in the gallery section.
Delineate-
Mac+
WinIt can turn raster (pixel-based) images into vector-based SVG images. Similar to the old Adobe Streamline.
ExifRenamer-
MacRename JPEG photos based on the time and date information embedded in the file.
Video Freeware
VLC-
Mac+
WinProbably the best video player. It even plays DVDs.
Jahshaka-
Mac+
Win"The worlds first open source, hardware accelerated editing and effects system."
MPEG Streamclip-
Mac+
WinThis is a great program to edit or cut up video. It can also compress video in certain ways, and split the audio and video into seperate files. At least in general it does not convert compressed video into uncompressed video.
iSquint-
MacThe little free version of VisualHub allows you to convert video to play on your iPod.
3d Modelling Freeware
Blender-
Mac+
WinA 3d rendering and modeling program.
Terragen-
Mac+
WinA 3d scenery generator.
Website Creation Freeware
Internet Freeware
Firefox-
Mac+
WinThe great browser. ...although the Mac version isn't as far along as the PC version. Mac-users might want to pick either Camino, Opera, or Safari.
Camino-
MacA Mac browser based on the Mozilla engine (like Firefox). It currently does not support plugins or themes, but it does have several features not in Firefox by default.
Transmission-
MacI don't use BitTorrent that much, but this is a good Mac client. It's small and light.
CyberDuck-
MacFTP & SFTP
SiteSucker-
MacDownload entire websites. It can even "localize the files it downloads, allowing you to browse a site offline."
Office and/or Word Processing Freeware
OpenOffice-
Mac+
WinAn open-source alternative to Office, etc.
The Mac version requires X11 to be installed.
NeoOffice-
MacA ported Mac version of Open-Office that
does not require X11. It uses Java instead.
Disk Burning Freeware
Security and Anti-Virus Freeware
ClamXav-
MacOpen-source anti-virus.
GlowWorm-
MacA rule-based firewall. If you download the shareware version, it operates in free "lite" mode if you do not register.
AVG Anti-Virus Free-
WinThe free version of AVG Anti-virus.
Zone Alarm Free-
WinThe free version of Zone Alarm Firewall.
File Management Freeware
UnRarX-
MacOpens RAR and a few other compressed files.
The Unarchiver-
MacOpens most compressed files. It even handles (non .sitx) stuffit files.
CleanArchiver-
MacCompresses zip, gzip and bzip2. The unusual thing about this program is that it can exclude many of the invisible mac files.
AJoiner-
MacJoin Mastersplitter-type (ending with .001, .002, etc.) split files.
Utility Freeware
Alarm Clock 2-
MacAn Alarm Clock for your menu bar It also works as a timer, or a stopwatch, and it can play iTunes songs as the alarm.
iBackup-
MacA very easy to use backup program.
AppDelete-
MacA Mac Uninstaller. It trashes files originally installed by programs.
DMGconverter-
Mac"A Disk Image (.dmg, .cdr, .iso) creation and conversion tool."
Games Freeware
ScummVM-
Mac+
WinIt allows you to play old Sierra games like Space Quest or King's Quest, or games from LucasArts like The Secret of Monkey Island or The Dig, etc.
You must have the original data files from the retail copies of games.