mac

Adium
- Opensource IM program

Burn
- Way to burn iso or data disks

Chicken of the VNC
- A VNC client for the mac

Cyberduck
- A graphic FTP client

FreeDMG
- A DMG creator. Free and pretty easy to use

FrostWire
- A LimeWire clone with all the crap ripped out of it

Fugu
- A graphical ssh, scp and sftp client

HandBrake
- Best way to rip DVD to avi,mkv,mov,etc

Lightroom
- A great program for people who do a lot of photo-processing. Not a replacement of Photoshop, but a nice addition

Little Snitch
- A great adaptive firewall to keep programs from "calling home"

MacTheRipper
- Way to rip a DVD to a disk. Play with VLC or burn with Toast

OpenOffice
- Now that the the beta is compiled for OSX it launches faster and doesn't require X11

Senuti
- Copy data from an iPod without being the iTunes owner

Skype
- Make calls over the internet. Can send to landlines for money

Stellarium
- View the nightsky with the constelations

VLC
- Plays just about any file format under the sun. And works with the macbook remote

Vuse
- Bittorrent client


linux

Inkscape
- The best open source Vector graphics program. Hands down

Unicode rxvt
- A great lightweight terminal

Straw
- A good stand-alone RSS reader


palm

Arvale
- An RPG. Nice graphics, and **FREE**

Classics
- A collection of games from pda mill.

FreeRange
- A RSS reader. The nice feature is that is stores your feeds online, and you can update them there too.

GooSync
- Keeps your google calendar sync'd up. The free version is a little more limited, but still works.

Kinoma
- A media player to play videos, audio, pictures and "interactive media"

MetrO
- A map software for most of the Metro systems in the world. (Including GTA4)

Mobipocket
- A digital book reader. For mobipocket books.

MoTwit
- A Twitter logger

Opera Mini
- The Opera browser it's better for some of the more "media rich" pages.

PalmPDF
- A port of Xpdf.

Plucker
- A mobile book reader. Supports books from project gutenberg and manybooks.net

pssh
- A port of OpenSSH. Includes pubkey support.

Snails
- A "worms" or "scorched earth" clone.

Solitaire 1 & 2
- Bunch of fun solitaire card games

Tryda
- The yellow pages rolled into an app. Really handy