Here is a list of applications that I find myself using very commonly over the past few years. There have been many more but in the end they don’t get used as often so I’m not listing them here. I’m also not listing the ones that come with Mac OS X, just the additional ones.
General Use
Growl – Growl is a great notifying system that puts non-irritating popups on your screen. Very configurable and lots of applications make use of it. If you install Adium (see below) then it will offer to install growl for you.
Inquisitor – This is a fancier interactive search for Safari. Also works with other browsers.
iStat Menus – Very nice looking menu bar stats. Gives things like CPU usage, network traffic, etc. I really like the calendar menu item since it can show you the month calendar with one click.
Perian – Adds common codecs to quicktime so you can play most files. Also supports high def.
Quicksilver – Very awesome launcher app, among other things. Not obvious to use, but once you get started with it, it becomes essential. You can start with a tutorial.
VLC – Media player, I like this a lot more than quicktime. Can play most files and well.
1password – One password for everything. I could put this in the internet category since it plugs right into browsers, hit Apple-\ and it will log you in to the website. I’m leaving it as a general app because I use it for remembering all my passwords. The authors of this app are very generous, they give out free licenses very often. I think I got mine through macheist.
VoodooPad Pro – Personal wiki. This app is great for capturing all your memos and notes. Use it as a journal, meeting minute log, etc. Since all your documents can hyperlink to each other it makes finding and relating your info easier. The author of this app is very quick to respond and provide bug fixes.
OmniFocus – Great todo list manager. They call it getting-things-done which is a process of capturing and finishing off tasks. They also have an iphone/ipod app that can be your mobile version of the desktop app so that you can keep both in sync.
Internet
NetNewsWire – Great RSS news reader, and free.
Transmit – Good FTP client. There are probably free ones out there that are just as good, but I bought this a while ago and still find it meets my needs.
Adium – The best IM client. Can connect to most (all?) networks.
Office
iWork ‘08 – Much friendlier to use than microsoft word, excel, or powerpoint. Much cheaper too! Especially if you have several computers and get the family license.
Microsoft Office 2008 – I use this primarily for Entourage which is like Outlook for the PC. This is useful so that I can book meetings, other than that I could just use Apple Mail instead. Coming with Mac OS X Snow Leopard (10.6) will be built-in support for exchange, just like the iPhone. At that point I’ll delete these Office apps because they look ugly, use more CPU then they should, and often frustrate me to no end.
PocketMac Blackberry
– This is a necessary evil, for some reason you can’t charge your blackberry over USB unless you have this driver. I don’t use the syncing capabilities.
Programming
Textmate – I like this editor a lot. I also use VIM and miss its keybindings when I use TextMate, but other than that TextMate is great. Its easily extensible (wrote a few of my own bundles) since you can do it in any language you like (Python, Perl, shell, etc). I really wish it had split windows, thats the only important feature that it is missing in my opinion.
Parallels Desktop – I find that Parallels works great, its faster than VMWare Fusion when running QNX Neutrino. My only beef about this app is that they release major versions in what seems like less than a year requiring their end users to pay to upgrade. I guess it is good that they are working on it so hard, but at the same time as a user it would be nice to not have to pay to stay up to date. It is also very hard to find older (few months old) versions of this app so if you buy it, save the DMG file.
VMWare Fusion – I’ve been using this one more often recently, upgrades have been free compared to Parallels.
Photography
Aperture – Great photo database and RAW processing application. There are other good alternatives also.
ApertureToGallery Plugin – I use this plugin to sync with my gallery website.
NoiseNinja – Removes noise from images, does a good job. Don’t need this as much since I started using the Nikon D700.
Spyder3Pro – I got a Spyder3 color calibration device for my monitors since my prints were coming back terrible. This was caused by having monitors that weren’t calibrated correctly. In the end this device should save time and money so that I don’t have to print more than once.
Adobe Photoshop – I have CS3 version and got it for an unbeatable price (it is legitimate). I’d have a hard time (impossible?) paying $700 for this application. Two alternatives that come to mind are Pixelmator and Gimp.
Computers, Mac OS X