MAC APP STORE
This app lets you keep tab of everything you own. Create locations and add stuff you have there, complete with picture, price and purchase date.
The easiest way to tweak you pictures. Select picture, click on the effect and you are done. No technical expertise needed. A little aesthetic sense will help though.
An ideal app for people with too much on their hands. This app syncs with other devices and ensures that you workflow is smooth and up to date.
As you keep adding apps, you will need Alfred to launch them in one step. The Alfred tab can also help search the web as the well the Mac.
This app doubles up as a browser as well as music player and organiser. For those who need some help to put their large song collection in place.
Skitch for Mac
Use Skitch to annotate a picture, a text or a PDF file. It also works like a dream with screenshots, so that you can manipulate it the way you want.
Like on a PC, you can run VLC on the Mac too. This app will let you open almost all video formats as well as DVDS and audio CDS.