Hi Selim,
There are a heap of OTA (Over The Air) and desktop free applications at that link. If you don't have a BlackBerry data plan then most of the applications can be downloaded from your desktop then loaded to your BlackBerry. The web address is :
BerryReview.com | BlackBerry News & Reviews . Then just click on the free software link on the RHS.
BTW, at the store on BerryReview, most of the applications have a trial version so you can try before you buy.
Hope this helps,
KR
Greg Myers